Kaguya Shinomiya IQ

Kaguya is the vice president of an elite academy and the runner-up to its top student, and she earns that with preparation and analytical skill. Her schemes are layered and model what the other person will do. She is not higher because she is never the one who comes out ahead of Miyuki Shirogane, and most of her elaborate plans end in stalemates. She is not lower because the school treats her as a genuine genius and the story lets her earn it. The best description is gifted, not exceptional.

Age-normed for a 16 to 17-year-old high school student.

Six ratings out of ten, each based on what is shown on the page or screen. They are how the estimate is built, not a substitute for it.

Deduction7/10

Solving new problems from thin information

Strategy8/10

Multi-step plans that account for other minds

Knowledge8/10

Depth and breadth of what they know

Invention3/10

Building or devising something genuinely new

Adaptability6/10

Recovering when the plan breaks

Reading people6/10

Understanding what other people want and will do

1. Runner-up at an elite school

   Strong evidence

   Series premise, from Season 1

   Shuchiin Academy is a selective school whose top student, Miyuki Shirogane, is known across the prefecture, and Kaguya sits right behind him while also serving as student council vice president. Holding that position term after term is not luck. It demonstrates a broad, well-organised knowledge base and the discipline to keep it up under constant rivalry. It also sets the ceiling, because she cannot overtake the one person who defines the top. This is the basis of the estimate.

2. The movie invitation standoff

   Moderate evidence

   Season 1, episode 1

   In the first episode each of them tries to get the other to be the one who asks to see a film together. Kaguya thinks through how Miyuki will read the situation, what he will assume, and how she can appear indifferent while nudging him. He runs the mirror-image plan at the same moment, so the plot stalls. It is planning around another mind, and the elaborate effort spent on something so small shows both the skill and the limits of the reasoning.

3. The contact-info gambit

   Moderate evidence

   Season 1, episode 2

   Kaguya wants to swap contact details with Miyuki, but only if he is the one who asks. Miyuki wants exactly the same thing from her. Each builds a situation meant to make the other bring it up first, and each sidesteps the other's trap. The scene shows layered thinking and a working model of an opponent. It also shows an equal match rather than a superior one, which is why she cannot go past the top of the gifted band.

4. Tutoring Ishigami

   Moderate evidence

   Season 1, episode 8, Ishigami Closes His Eyes

   When first-year Yu Ishigami risks failing his exams, Kaguya tutors him so he can pass. She knows the material well enough to teach it and can get results on a deadline, which tests both knowledge and organisation. It is a supporting feat rather than a headline one, and it does not show invention. But few characters in a comedy about romantic gamesmanship get a scene where the competence is simply useful.

5. The umbrella stalemate

   Minor evidence

   Season 1, episode 5

   In the rain, Kaguya and Miyuki each try to get the other to ask to share an umbrella. Neither will say it, and each reads the other's bluffs accurately. Both characters read the situation correctly, and neither can convert the read into a win. It is a compact demonstration of sharp deduction with almost no payoff, and it explains why the estimate rests on the consistent results rather than any single scheme.

• Never ahead of MiyukiSeries-wideKaguya is the runner-up in the rankings, and in the war of nerves that drives the story she is never clearly ahead of the president. The long contest is a draw or he wins it. She adapts, but a character who cannot get ahead of the same rival across a whole series is not at the top of any scale.
• Blind spots outside strategy gamesSeries-wideKaguya struggles with digital technology and social media and starts out naive about romance and ordinary teenage life. These are ordinary gaps, but they contrast with her reputation as an all-round genius, and they separate her from characters whose knowledge is broad in every area.
• The fireworks plan falls apartSeason 1 finale, I Can't Hear the FireworksKaguya sets out to see the fireworks with Miyuki, misses the show, and it is Miyuki who has to find her afterwards. A schemer of her stated calibre would be expected to manage her own evening. The mishap is more about circumstances than mistakes of logic, but it fits a pattern of plans that are elaborate and fragile.

Kaguya scores well on knowledge, planning and deduction, and low on invention, because everything she does happens inside a school-scale contest. Her error rate is telling: her schemes regularly fail against a rival who is only marginally ahead, and she misreads people who are not chess opponents. Fans tend to give her 160 or more because the comedy frames every scheme as a battle of geniuses. The framing is doing more work than the results. We estimate from the results, which are a strong, consistent place just behind the top.

IQ estimates for fictional characters are fan analysis: an argument from what the story shows, not a measurement. Read the full method and the standards we hold every profile to.

Fans like to rank Kaguya among the great anime strategists, alongside Lelouch and Light, because the show scores every scheme as a battle of geniuses. The comparison fails on results. Lelouch and Light run plans against opponents who can actually kill them, and Kaguya's wars are fought over who invites whom to a film. We treat the comedy as a magnifying glass. Her reasoning is high and precise, but the stakes are low, and her toughest rival is consistently a little ahead of her.

• Kiyotaka Ayanokoji IQ: 150Hides the smartest move
• Kurisu Makise IQ: 155Young neuroscientist, published in Science
• Near IQ: 148Wins by patience and preparation
• Shikamaru Nara IQ: 145Lazy on purpose, sharp on demand