Gyrate is the Transformation Quirk carried by Sen Kaibara of U.A.'s Class 1-B. It lets him spin any part of his body at blistering speed, converting arms and hands into improvised drills that make his close-quarters fighting considerably more dangerous than his plain build would suggest.
Gyrate, written in Japanese as Senkai, is a close-range Transformation Quirk and the sole property of Sen Kaibara, a student in Class 1-B at U.A. High School. Readers first see it in Chapter 203, and the anime brings it in during Episode 95.
The Quirk grants rotation. Sen can whirl any portion of his body at tremendous speed, and the effect on his limbs is essentially that of a drill, which lifts his hand-to-hand output well above what it would otherwise be.
Rotation does not solve every problem. An opponent who gets a grip on Sen can still carry him around, and while he retains some capacity to strike back in that position, the Quirk offers no escape from it.
Sen Kaibara is the only known holder, and the power suits what appears to be his preferred fighting distance: right up against the target.
He supports it with equipment. A pair of fingerless gloves marked with spiral patterns turns the rotation into something far nastier, since the spirals bite like drill bits once his Quirk is running. The result inflicts heavy damage and makes any attempt to physically block him impractical.

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Gyrate is a Transformation Quirk belonging to Sen Kaibara that lets him spin any part of his body at tremendous speed, turning his arms and hands into drill-like weapons in close combat.
Sen Kaibara, a student in Class 1-B at U.A. High School, is the only known holder of the Gyrate Quirk.
Sen Kaibara wears fingerless gloves marked with spiral patterns that act like drill bits when combined with his spinning Gyrate Quirk, inflicting heavy damage and making him hard to block.
Gyrate does not prevent Sen Kaibara from being grappled and carried by an opponent; while he can still strike back in that position, the Quirk offers no way to escape a hold.
The Gyrate Quirk first appeared in Chapter 203 of the My Hero Academia manga, with the anime introducing it in Episode 95.
Looking for more on Gyrate? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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