Monster Cat

Monster Cat is the former Instant Villain from Vigilante - My Hero Academia: Illegals.

Appearance
Its appearance is identical to that of a normal cat.

After activating its Quirk by the effects of the Trigger, Monster Cat merged with the transport having two tails and the complete appearance of the transport with its face below the glass.

Personality
Once he was under the effects of the Trigger, Monster Cat became violent and erratic.

Abilities
High Speed: Monster Cat is quite fast thanks to the merger with transport.

Quirk
Monster Cat: The Monster Cat Quirk seems to allow its user to merge with objects and assume their shape. It can also be defused from the object.

Trivia

 * Its merged form might be based on Catbus from My Neighbour Totoro.