Note: The reason why he has a Quick called “animal spirit” It’s because he can use the abilities of any animal he desires but. He does not turn into the animal he just uses the abilities not the actual side effects For example his arm in the picture is a reminiscent of “gorilla strength” Basically his strength increases by an extension amount and if he says he wanted to use a scorpion tail his reptile tail will turn into a scorpions tail but he would not be able to inject the venom So that’s what his quick can do.

P.s: And no he is not Deku’s predecessor He did not give his Quick to beast. He just has a kind of a similar Quick

Yep

Yep