He is a giant wolf
The reason he allowed kacchan to believe he is quirkless is because he actually is and him being a werewolf deals with his family being from packs his dad is an alpha but his mom wanted to move to the city to see what it is like and every summer he goes "camping" so he can shift and his wolf not get restless.
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Werewolf deku
WerewolfDeku can't find a way to keep himself hidden when he moves to the dorms and what happens when kacchan finds out.