IQ

Saiko Intelli holds this anime original Emitter Quirk, which debuts in Episode 55. Classified as internal in range, it works on nobody but her, multiplying her own intelligence rather than reaching outward.

The ritual matters as much as the power. Tea goes down, her eyes close, and only then does the boost arrive.

Once active, her intellect scales up sharply and she becomes a super genius for a stretch of time. Combined with what she already knows, that surge lets her build intricate plans and read her opponents several moves ahead. While she thinks, glowing yellow equations swirl through the air around her, threaded with orange diagrams of electronic circuitry. Different varieties of tea are said to produce different results, though the series never puts that on screen.

The catches are real. No plan she assembles comes out perfect, and without tea the Quirk simply will not switch on. It contributes nothing to fighting or defending herself either, a gap that decided her Provisional Hero License Exam: Momo Yaoyorozu and Tsuyu Asui pinned her down and overwhelmed her, and she lost.

Her calculations did track down and box in Momo, Tsuyu, Mezo Shoji, and Kyoka Jiro during that exam. The variable she could not solve for was Creation. Momo's Quirk is flexible enough that it poisoned the math, leaving Saiko unable to forecast the counterattack that beat her.

Saiko Intelli is the lone user. The closest parallel in the series is High Specs, the Quirk belonging to Nezu, which likewise raises its holder's intelligence.