Smartest fictional characters, ranked

81 fictional minds from anime, television, film, games, cartoons and books, ranked by what they actually do in their stories. Every number comes with a range, the scenes behind it and the mistakes that hold it down.

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The full ranking

Smartest fictional characters, ranked, by evidence-based IQ estimate
#	Character	Franchise	Range	Confidence	IQ
1	Rick SanchezRick and Morty	Rick and Morty	170 to 190	Medium	180
2	Reed RichardsMarvel	Marvel	165 to 185	Medium	175
3	Doctor DoomMarvel Comics	Marvel Comics	155 to 185	Medium	170
4	Grand Admiral ThrawnStar Wars	Star Wars	155 to 180	Medium	170
5	OzymandiasWatchmen	Watchmen	165 to 178	High	170
6	Bruce BannerMarvel Cinematic Universe	Marvel Cinematic Universe	155 to 175	Medium	165
7	Ender WigginEnder's Game	Ender's Game	150 to 180	Medium	165
8	Lex LuthorDC Comics	DC Comics	150 to 180	Medium	165
9	Senku IshigamiDr. Stone	Dr. Stone	155 to 175	Medium	165
10	Sherlock HolmesSherlock Holmes (Arthur Conan Doyle)	Sherlock Holmes (Arthur Conan Doyle)	155 to 175	High	165
11	SpockStar Trek	Star Trek	155 to 175	Medium	165
12	Albus DumbledoreHarry Potter	Harry Potter	150 to 172	Medium	160
13	Dr. EggmanSonic the Hedgehog	Sonic the Hedgehog	145 to 175	Medium	160
14	L LawlietDeath Note	Death Note	150 to 168	Medium	160
15	ShuriMarvel Cinematic Universe	Marvel Cinematic Universe	146 to 172	Medium	160
16	Sosuke AizenBleach	Bleach	148 to 172	Medium	160
17	Tony StarkMarvel Cinematic Universe	Marvel Cinematic Universe	148 to 170	Medium	160
18	Walter BishopFringe	Fringe	145 to 172	Medium	160
19	Kurisu MakiseSteins;Gate	Steins;Gate	145 to 165	Medium	155
20	Light YagamiDeath Note	Death Note	145 to 165	Medium	155
21	Matilda WormwoodMatilda	Matilda	140 to 170	Medium	155
22	Sheldon CooperThe Big Bang Theory	The Big Bang Theory	142 to 168	Medium	155
23	Will HuntingGood Will Hunting	Good Will Hunting	140 to 168	Medium	155
24	Spencer ReidCriminal Minds	Criminal Minds	140 to 163	Medium	152
25	Erwin SmithAttack on Titan	Attack on Titan	138 to 162	Medium	150
26	Gus FringBreaking Bad	Breaking Bad	138 to 160	Medium	150
27	Itachi UchihaNaruto	Naruto	140 to 160	Medium	150
28	Jimmy NeutronJimmy Neutron: Boy Genius	Jimmy Neutron: Boy Genius	138 to 165	Medium	150
29	Kiyotaka AyanokojiClassroom of the Elite	Classroom of the Elite	140 to 160	Low	150
30	Lelouch vi BritanniaCode Geass	Code Geass	140 to 160	Medium	150
31	Shogo MakishimaPsycho-Pass	Psycho-Pass	138 to 160	Medium	150
32	Stewie GriffinFamily Guy	Family Guy	140 to 162	Medium	150
33	Temperance BrennanBones	Bones	138 to 162	Medium	150
34	The BrainPinky and the Brain	Pinky and the Brain	138 to 160	Medium	150
35	The RiddlerBatman	Batman	138 to 162	Medium	150
36	Tyrion LannisterGame of Thrones / A Song of Ice and Fire	Game of Thrones / A Song of Ice and Fire	140 to 158	Medium	150
37	Gregory HouseHouse M.D.	House M.D.	135 to 158	Medium	148
38	NearDeath Note	Death Note	138 to 158	Medium	148
39	Schneizel el BritanniaCode Geass	Code Geass	136 to 158	Medium	148
40	Hermione GrangerHarry Potter	Harry Potter	138 to 156	Medium	147
41	Dexter (Dexter's Laboratory)Dexter's Laboratory	Dexter's Laboratory	132 to 158	Medium	145
42	Doctor StrangeMarvel Cinematic Universe	Marvel Cinematic Universe	135 to 158	Medium	145
43	Edward ElricFullmetal Alchemist: Brotherhood	Fullmetal Alchemist: Brotherhood	132 to 158	Medium	145
44	Johan LiebertMonster	Monster	130 to 160	Low	145
45	Petyr Baelish (Littlefinger)Game of Thrones	Game of Thrones	132 to 156	Medium	145
46	Shikamaru NaraNaruto	Naruto	135 to 155	Medium	145
47	Shinichi Kudo (Conan Edogawa)Detective Conan (Case Closed)	Detective Conan (Case Closed)	132 to 158	High	145
48	Sora (No Game No Life)No Game No Life	No Game No Life	132 to 158	Low	145
49	Arisu SakayanagiClassroom of the Elite	Classroom of the Elite	130 to 152	Medium	142
50	The Professor (Sergio Marquina)Money Heist	Money Heist	132 to 152	Medium	142
51	Walter WhiteBreaking Bad	Breaking Bad	130 to 152	Medium	142
52	Armin ArlertAttack on Titan	Attack on Titan	128 to 152	Medium	140
53	Izaya OriharaDurarara!!	Durarara!!	128 to 152	Medium	140
54	Kakashi HatakeNaruto	Naruto	128 to 150	Medium	140
55	Lisa SimpsonThe Simpsons	The Simpsons	125 to 155	Medium	140
56	Loid ForgerSpy x Family	Spy x Family	128 to 150	Medium	140
57	Miles "Tails" ProwerSonic the Hedgehog	Sonic the Hedgehog	128 to 152	Medium	140
58	Miyuki ShiroganeKaguya-sama: Love Is War	Kaguya-sama: Love Is War	128 to 150	Medium	140
59	Raymond ReddingtonThe Blacklist	The Blacklist	128 to 150	Medium	140
60	Shaun MurphyThe Good Doctor	The Good Doctor	128 to 150	Medium	140
61	ShiroeLog Horizon	Log Horizon	128 to 152	Medium	140
62	Walter O'BrienScorpion	Scorpion	130 to 152	Medium	140
63	Frank UnderwoodHouse of Cards (US)	House of Cards (US)	126 to 148	Medium	138
64	MelloDeath Note	Death Note	128 to 148	Medium	138
65	Mike RossSuits	Suits	128 to 148	Medium	138
66	Suzune HorikitaClassroom of the Elite	Classroom of the Elite	126 to 148	Medium	138
67	Kaguya ShinomiyaKaguya-sama: Love Is War	Kaguya-sama: Love Is War	122 to 148	Medium	135
68	Rust CohleTrue Detective	True Detective	125 to 145	Medium	135
69	Satoru GojoJujutsu Kaisen	Jujutsu Kaisen	120 to 150	Medium	135
70	Saul GoodmanBetter Call Saul	Better Call Saul	122 to 148	Medium	135
71	Solid SnakeMetal Gear	Metal Gear	122 to 148	Medium	135
72	Abed NadirCommunity	Community	120 to 140	Low	130
73	Gordon FreemanHalf-Life	Half-Life	115 to 145	Low	130
74	Killua ZoldyckHunter x Hunter	Hunter x Hunter	118 to 145	Medium	130
75	Okabe RintaroSteins;Gate	Steins;Gate	118 to 138	Medium	128
76	Naruto UzumakiNaruto	Naruto	105 to 132	Medium	118
77	GokuDragon Ball	Dragon Ball	98 to 120	Medium	108

Off the human scale

These characters are superhuman by design, such as machines and alien minds. A human IQ number does not describe them, so they are listed apart from the ranking and their figures are for reference only.

Superhuman characters, not ranked against humans
Character	Franchise	Reference
MeruemHunter x Hunter	Hunter x Hunter	200185 to 220
GLaDOSPortal	Portal	195175 to 215
The DoctorDoctor Who	Doctor Who	185170 to 200
DataStar Trek: The Next Generation	Star Trek: The Next Generation	180170 to 192

How we ranked them

The ranking uses one rubric for everyone: abstract reasoning, planning under uncertainty, learning speed and breadth, invention and how often the character is outplayed. It is designed so that a character who is told to be a genius, but never shown solving anything, cannot outrank one who wins by thinking.

Characters that are superhuman by design, such as androids and AIs, are ranked but flagged, because a human IQ scale does not measure them. Estimates for teenagers are age-normed at their age in the story.

Stated IQs from the shows themselves appear in the table at the end. Where they differ from our estimate we say why. The full rules are on the method page.

Why each one sits where it does

1. Rick Sanchez
Rick and Morty
Rick Sanchez's IQ is best estimated at about 180 (range 170 to 190): the most inventive mind in his corner of the multiverse, undercut by his own baggage and blind spots.
2. Reed Richards
Marvel
Reed Richards' IQ is about 175 (range 165 to 185): the widest scientific range in Marvel, offset by errors of judgement that would sink a smaller reputation.
3. Doctor Doom
Marvel Comics
Doctor Doom's IQ is about 170 (range 155 to 185). He combines advanced engineering with sorcery and rule over a nation, though his pride and his fixation on Reed Richards lead to repeated defeats.
4. Grand Admiral Thrawn
Star Wars
Thrawn's IQ is about 170 (range 155 to 180). His signature skill is reading an opponent through their culture and art, and he wins campaigns through preparation, though he is brought down by a betrayal he did not foresee.
5. Ozymandias
Watchmen
Adrian Veidt's IQ is about 170 (range 165 to 178): he plans a world-altering deception across years and beats every hero who tries to stop him, save the one he cannot silence.
6. Bruce Banner
Marvel Cinematic Universe
Bruce Banner's IQ is best estimated at about 165 (range 155 to 175): a world-class gamma physicist whose on-screen work is mostly supporting, with one costly lapse in Age of Ultron.
7. Ender Wiggin
Ender's Game
Ender Wiggin's IQ is about 165 (range 150 to 180), age-normed: a child tactician who reinvents zero-gravity combat and wins a war, but who is managed by the adults around him.
8. Lex Luthor
DC Comics
Lex Luthor's IQ is about 165 (range 150 to 180): a gifted scientist, businessman and politician whose pride is the recurring reason he loses to Superman.
9. Senku Ishigami
Dr. Stone
Senku Ishigami's IQ is about 165 (range 155 to 175): the widest scientific knowledge and fastest practical invention in his cast, discounted for a story that keeps handing him what he needs.
10. Sherlock Holmes
Sherlock Holmes (Arthur Conan Doyle)
Sherlock Holmes's IQ is estimated at about 165 (range 155 to 175) in Conan Doyle's stories: repeated, verifiable deductions from thin evidence, with a few honest defeats.
11. Spock
Star Trek
Spock's IQ is best estimated at about 165 (range 155 to 175): he solves novel problems from thin data across several sciences, but his model of people wobbles when they are the variable.
12. Albus Dumbledore
Harry Potter
Albus Dumbledore's IQ is about 160 (range 150 to 172): a gifted duellist and strategist who reconstructs Voldemort's Horcruxes, but who errs badly where his own feelings are involved.
13. Dr. Eggman
Sonic the Hedgehog
Dr. Eggman's IQ is about 160 (range 145 to 175). The series is widely said to give 300, and his machines are formidable, but he loses to Sonic in nearly every game.
14. L Lawliet
Death Note
L's IQ is best estimated at about 160 (range 150 to 168): he pins down Kira's region and then Kira's household from almost nothing, yet never gets proof.
15. Shuri
Marvel Cinematic Universe
Shuri's IQ is about 160 (range 146 to 172), norming her as a teenager. She runs Wakanda's technology design, heals a serious injury and designs the Black Panther suit, which makes her a top inventor in the MCU.
16. Sosuke Aizen
Bleach
Sosuke Aizen's IQ is best estimated at 160 (range 148 to 172): a patient long-game schemer with a century of flawless deception, undone by contempt for the people he had underestimated.
17. Tony Stark
Marvel Cinematic Universe
Tony Stark's IQ is estimated at about 160 (range 148 to 170): real engineering feats under pressure, from a cave-built suit to time travel, held back by reckless calls like Ultron.
18. Walter Bishop
Fringe
Walter Bishop's IQ is about 160 (range 145 to 172). Fan wikis cite 196, but we found no episode that states it. His science is extraordinary, and years of drug use and institutional care have scarred his judgement.
19. Kurisu Makise
Steins;Gate
Kurisu Makise's IQ is around 155 (range 145 to 165): a real prodigy in neuroscience and theory, backed by a published record, though she is narrower than Senku or Tony Stark.
20. Light Yagami
Death Note
Light Yagami's IQ is around 155 (range 145 to 165): a brilliant, adaptive planner who beats L, but whose pride and dependence on proxies finally cost him against Near.
21. Matilda Wormwood
Matilda
Matilda Wormwood's IQ is about 155 (range 140 to 170), norming her as a five-year-old. She reads classic novels and does large sums in her head, but her gifts are shown mostly through reading and arithmetic.
22. Sheldon Cooper
The Big Bang Theory
Sheldon Cooper's canon IQ is 187, but our estimate is about 155 (range 142 to 168): real theoretical physics and a shared Nobel, offset by years on a dead end and a narrow mind.
23. Will Hunting
Good Will Hunting
Will Hunting's IQ is about 155 (range 140 to 168). The film never states a number, but the way other characters react to his maths and recall puts him well inside the exceptional range.
24. Spencer Reid
Criminal Minds
Spencer Reid's canon IQ is 187; our estimate is about 152 (range 140 to 163). His memory and knowledge are exceptional, but casework leans on a team and he suffers costly setbacks.
25. Erwin Smith
Attack on Titan
Erwin Smith's IQ is best estimated at 150 (range 138 to 162): an exceptional tactician and political operator whose plans work, at a cost in lives a top planner would manage better.
26. Gus Fring
Breaking Bad
Gus Fring's IQ is estimated at about 150 (range 138 to 160): decades of patient, layered planning and near-flawless discipline, with one fatal misjudgment of Walter White.
27. Itachi Uchiha
Naruto
Itachi Uchiha's IQ is best estimated at 150 (range 140 to 160): an exceptional long-range planner and reader of people, held back by one plan that cost him everything.
28. Jimmy Neutron
Jimmy Neutron: Boy Genius
Jimmy Neutron's IQ is about 150 (range 138 to 165) for an eleven-year-old. The franchise is commonly said to give 210, but his inventions keep backfiring, which points to a gifted child and not a mind at the very top.
29. Kiyotaka Ayanokoji
Classroom of the Elite
Kiyotaka Ayanokoji's IQ is about 150 (range 140 to 160): a calm, adaptive planner who steers his class from the shadows, though his opponents are teenagers and much of his legend is told.
30. Lelouch vi Britannia
Code Geass
Lelouch's IQ is about 150 (range 140 to 160): a gifted tactician who plans well and improvises brilliantly, but leans on Geass and is repeatedly blindsided by family and by allies.
31. Shogo Makishima
Psycho-Pass
Shogo Makishima's IQ is about 150 (range 138 to 160). He builds crimes through other people and evades a system that measures everyone, and his weakness is the very obsession that sets him on that path.
32. Stewie Griffin
Family Guy
Stewie Griffin's IQ is best estimated at about 150 (range 140 to 162): an extraordinary inventor whose toddler tantrums and collapsing world-domination plans keep him below the top tier.
33. Temperance Brennan
Bones
Temperance Brennan's stated IQ is 180; our estimate is about 150 (range 138 to 162). Her forensic knowledge is elite, but her insight into people and situations is the weakest part of the picture.
34. The Brain
Pinky and the Brain
The Brain's IQ is about 150 (range 138 to 160). He plans elaborate world-takeover schemes every night, but a long record of failure shows flaws in foresight and in choosing partners.
35. The Riddler
Batman
The Riddler's IQ is about 150 (range 138 to 162). He sets puzzles that challenge Batman and sometimes learns his secrets, but his compulsion to leave clues leads to his repeated defeat.
36. Tyrion Lannister
Game of Thrones / A Song of Ice and Fire
Tyrion Lannister's IQ is about 150 (range 140 to 158): the sharpest political and tactical mind on the board for much of the story, but an emotional decision-maker when it counts.
37. Gregory House
House M.D.
Gregory House's IQ is estimated at about 148 (range 135 to 158): elite diagnostic reasoning across many specialties, held back by how often he is wrong for most of an episode.
38. Near
Death Note
Near's IQ is about 148 (range 138 to 158): a patient successor to L who catches Kira through preparation, a counter-trap and a team, rather than through solo brilliance.
39. Schneizel el Britannia
Code Geass
Schneizel's IQ is about 148 (range 136 to 158). He is the one strategist Lelouch cannot easily out-think, though his own plan depends on a weapon and he is outplayed in the end.
40. Hermione Granger
Harry Potter
Hermione Granger's IQ is about 147 (range 138 to 156) for her age: she solves logic puzzles, deduces the basilisk and Lupin's secret, but sometimes trusts rules over people.
41. Dexter (Dexter's Laboratory)
Dexter's Laboratory
Dexter's IQ is about 145 (range 132 to 158) for a child. He designs elaborate machines in a secret lab, but his sister Dee Dee regularly defeats him, which limits his ceiling.
42. Doctor Strange
Marvel Cinematic Universe
Doctor Strange's IQ is about 145 (range 135 to 158). The films show a surgeon with a photographic memory, fast learning and a clever answer to Dormammu, but not the genius of Tony Stark or Reed Richards.
43. Edward Elric
Fullmetal Alchemist: Brotherhood
Edward Elric's IQ is best estimated at 145 (range 132 to 158): an exceptional alchemy prodigy with sharp scientific reasoning, held back by a catastrophic early mistake.
44. Johan Liebert
Monster
Johan Liebert's IQ is roughly 145 (range 130 to 160): a gifted manipulator whose greatest feats are psychological and hard to measure, which is why the estimate is wide.
45. Petyr Baelish (Littlefinger)
Game of Thrones
Petyr Baelish's IQ is estimated at about 145 (range 132 to 156): elite manipulation and financial scheming, undone in the TV show by overconfidence about people he thought he had read.
46. Shikamaru Nara
Naruto
Shikamaru Nara's IQ is best estimated at 145 (range 135 to 155): a first-rate tactician whose preparation beats stronger enemies, but not quite the flawless 200-plus genius the canon line suggests.
47. Shinichi Kudo (Conan Edogawa)
Detective Conan (Case Closed)
Shinichi Kudo's IQ is best estimated at 145 (range 132 to 158): an exceptional detective with hundreds of solved cases, outplayed at the start and still short of closing his main case.
48. Sora (No Game No Life)
No Game No Life
Sora's IQ is about 145 (range 132 to 158). He is half of Blank, an undefeated pair of gamers, and wins by reading people and rules, though much of the show's brilliance belongs to his sister Shiro.
49. Arisu Sakayanagi
Classroom of the Elite
Arisu Sakayanagi's IQ is about 142 (range 130 to 152). She leads the top class with chess-like strategy, though her health and her own pride place limits on her plans.
50. The Professor (Sergio Marquina)
Money Heist
The Professor's IQ is about 142 (range 132 to 152). He plans a heist years ahead and adapts when it goes wrong, but his planning is fragile around people he cares about.
51. Walter White
Breaking Bad
Walter White's IQ is estimated at about 142 (range 130 to 152): elite chemistry and real improvised strategy against Gus Fring, offset by pride-driven errors that keep costing him.
52. Armin Arlert
Attack on Titan
Armin Arlert's IQ is best estimated at 140 (range 128 to 152): a gifted improviser and negotiator for his age, with real strategic instinct but an uneven record and little raw power.
53. Izaya Orihara
Durarara!!
Izaya Orihara's IQ is best estimated at 140 (range 128 to 152): a gifted manipulator of gangs and rumours, but stabbed, outplayed and undone by his fixation on Shizuo.
54. Kakashi Hatake
Naruto
Kakashi Hatake's IQ is about 140 (range 128 to 150). He is a prodigy who became a ninja at a very young age, with strong tactics and memory, though some of his edge comes from a borrowed eye.
55. Lisa Simpson
The Simpsons
Lisa Simpson's IQ is best estimated at about 140 (range 125 to 155), a little below her stated canon score of 159: clearly gifted, but often more certain than she is clever.
56. Loid Forger
Spy x Family
Loid Forger's IQ is about 140 (range 128 to 150). As the spy Twilight he infiltrates, adapts and plans well under pressure, but his domestic life shows the limits of his reading of people.
57. Miles "Tails" Prower
Sonic the Hedgehog
Tails' IQ is about 140 (range 128 to 152) for a child. Fan guides cite far higher numbers, but the evidence is a gifted young mechanic and pilot who often needs Sonic to finish the job.
58. Miyuki Shirogane
Kaguya-sama: Love Is War
Miyuki Shirogane's IQ is about 140 (range 128 to 150). He is the top student at an elite school and wins the love war through effort and cunning, which is a different sort of genius from Kaguya's.
59. Raymond Reddington
The Blacklist
Raymond Reddington's IQ is about 140 (range 128 to 150). His strength is knowledge, networks and reading people, not the abstract reasoning of a lab genius.
60. Shaun Murphy
The Good Doctor
Shaun Murphy's IQ is about 140 (range 128 to 150). The show never states a number. His visual memory and diagnostic leaps are exceptional, but his gifts are narrow and he leans on mentors.
61. Shiroe
Log Horizon
Shiroe's IQ is about 140 (range 128 to 152). He leads by planning and negotiation after thousands of players are trapped in a fantasy game world, and the show makes him the cleverest player in it.
62. Walter O'Brien
Scorpion
Walter O'Brien's stated IQ is 197; our estimate is about 140 (range 130 to 152). He fixes technical emergencies fast and leads a team of specialists, but the number is borrowed from a real person's disputed claim.
63. Frank Underwood
House of Cards (US)
Frank Underwood's IQ is estimated at about 138 (range 126 to 148): superb political and psychological strategy, but a career built on leverage rather than deep reasoning, and a stalled presidency.
64. Mello
Death Note
Mello's IQ is around 138 (range 128 to 148): a gifted, aggressive problem-solver who gets results the cautious cannot, and who pays for the risks.
65. Mike Ross
Suits
Mike Ross's IQ is about 138 (range 128 to 148). His photographic memory is genuinely rare, but the show also records the poor judgement that keeps exposing him.
66. Suzune Horikita
Classroom of the Elite
Suzune Horikita's IQ is about 138 (range 126 to 148). She is an excellent student and a capable planner, whose proud and solitary approach limits her in a school built on cooperation.
67. Kaguya Shinomiya
Kaguya-sama: Love Is War
Kaguya Shinomiya's IQ is best estimated at about 135 (range 122 to 148): a near-top student and precise planner, held back by pride and a habit of overthinking tiny stakes.
68. Rust Cohle
True Detective
Rust Cohle's IQ is about 135 (range 125 to 145). He spots patterns across cases and reads suspects well, but the story shows a mind that is brilliant, bleak and self-defeating.
69. Satoru Gojo
Jujutsu Kaisen
Satoru Gojo's IQ is best estimated at 135 (range 120 to 150): a gifted innovator and teacher whose strength far outruns his strategic judgement, and who is twice caught by traps.
70. Saul Goodman
Better Call Saul
Saul Goodman's IQ is estimated at about 135 (range 122 to 148): outstanding verbal and social intelligence and quick improvisation, but his schemes collapse when emotion gets involved.
71. Solid Snake
Metal Gear
Solid Snake's IQ is best estimated at about 135 (range 122 to 148), well below his profile-stated 180: an elite operator who keeps being played by people on his own side.
72. Abed Nadir
Community
Abed Nadir's IQ is about 130 (range 120 to 140). He is the show's pattern reader, with a gift for structure and for modelling how stories and groups behave.
73. Gordon Freeman
Half-Life
Gordon Freeman's IQ is best estimated at about 130 (range 115 to 145): a credible MIT-trained physicist, but a silent hero whose puzzle-solving is done by the player, so confidence is low.
74. Killua Zoldyck
Hunter x Hunter
Killua Zoldyck's IQ is best estimated at about 130 (range 118 to 145): a fast learner and sharp tactician whose reasoning is real but narrower than the genius label suggests.
75. Okabe Rintaro
Steins;Gate
Okabe Rintaro's IQ is about 128 (range 118 to 138): sharp, stubborn and a superb leader, but the real scientific talent in his lab is Kurisu, and his defining power is not intellectual.
76. Naruto Uzumaki
Naruto
Naruto Uzumaki's IQ is best estimated at about 118 (range 105 to 132): weak on academics and deduction, but a genuinely creative improviser who is unusually good with people.
77. Goku
Dragon Ball
Goku's IQ is best estimated at about 108 (range 98 to 120): average outside combat, but with exceptional learning speed and improvisation once a fight starts.
Meruem
Hunter x Hunter · off the human scale
Meruem's IQ is placed at about 200 (range 185 to 220), but as a non-human by design human scales do not really apply. He learns and adapts faster than anyone we cover.
GLaDOS
Portal · off the human scale
GLaDOS's IQ is best rated at about 195 for ranking only (range 175 to 215): a superhuman machine intelligence whose repeated misjudgements of one test subject keep her from being flawless.
The Doctor
Doctor Who · off the human scale
The Doctor's IQ is about 185 (range 170 to 200), and the number is for ranking only because a Time Lord is not human. The evidence is wide: improvised plans, deep science and a long record of outwitting enemies.
Data
Star Trek: The Next Generation · off the human scale
Data's IQ is roughly 180 (range 170 to 192), but as an android he sits outside the human scale: his memory and speed are superhuman, while his judgement, though strong, can be beaten.

When the story states an IQ, and we disagree

Some fictional characters come with a number. Here is what the story says next to what the evidence supports.

Stated IQ in canon against our estimate
Character	Canon	Ours
Dr. Eggman	300	160
Sheldon Cooper	187	155
Spencer Reid	187	152
Jimmy Neutron	210	150
Temperance Brennan	180	150
Shikamaru Nara	200	145
Lisa Simpson	159	140
Walter O'Brien	197	140
Solid Snake	180	135

Smartest fictional characters, ranked: common questions

Who is the smartest fictional character of all time?

Among characters on a human scale, our evidence ranks Rick Sanchez (Rick and Morty) highest, at about 180. Superhuman characters, such as AIs and androids, rank higher on paper but cannot really be compared with a human IQ.

How can a fictional character have an IQ?

It cannot be measured, so it is an argument. We look at what the character does, weigh mistakes as well as feats, and map that to an IQ band with a range and a confidence level. Some series state a number, and we treat that as a story fact.

Which characters have an official IQ?

A handful. Sheldon Cooper and Spencer Reid are both stated at 187, Solid Snake at 180 and Lisa Simpson at 159. The table above compares each with our estimate.

Why are the estimates lower than fan claims?

Fan numbers often reward how impressive a character seems and ignore mistakes. Our method treats being repeatedly outplayed as evidence, so numbers of 200 or more are reserved for characters who are superhuman by design.

How do I find my own IQ?

Only a supervised test can give it. A fast first look is a reasoning test: LifeScore has a 25-question visual test that takes about 12 minutes.

What's your IQ?

The characters above are estimates from fiction. Your own reasoning is easy to check: 25 visual pattern and rule questions.