Big Monkey is a Transformation Quirk from My Hero Academia: Vigilantes, held by Rikiya Eno. Every recorded use of it happens while he is dosed with Trigger, the drug that inflates Quirk output, which leaves its baseline capacity outside that chemical boost entirely unrecorded.
Big Monkey belongs to Rikiya Eno and operates at melee range. It is classified as a Transformation Quirk, and it debuts in Chapter 21 of the My Hero Academia: Vigilantes manga.
While Trigger is running through him, Rikiya swells into an enormous ape. Since that drugged state is the only condition in which the power has ever been observed, what the transformation amounts to without the enhancement remains unknown.

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Big Monkey is a Transformation Quirk from My Hero Academia: Vigilantes that turns its user into an enormous ape.
Big Monkey is used by the villain Rikiya Eno, first appearing in Chapter 21 of the My Hero Academia: Vigilantes manga.
It is unknown. Every recorded use of Big Monkey has happened while Rikiya Eno was dosed with the drug Trigger, so its natural capacity without that boost has never been shown.
Big Monkey is a melee range Quirk, meaning Rikiya Eno relies on direct physical contact once he has transformed.
Big Monkey is similar to a separate ability called King Kong, which is noted as producing the same transformation result.
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