Dee: Probably buy a huge house and adopt every abandoned pet (which is the equivalent of adopting a bunch of kids since he is also a pet) he can fit in it.
Bennie: spend it frugally but eat well.
Bani: a name change. then likely stock up on gender potions and give them out for free to other trans pets
Fadil: he uhh....already has that much via his dad. he'd probably just donate it or something cause they dont need it.
Aegis: give it to his mom.
Doop: overspend on gifts for legit everybody he knows and then ones for complete strangers and then realize its all gone and he got nothing for himself.
David: "what am i supposed to do with this!?!?!"
April: Probably drop random gifts of money off to her patrons and followers.
Duluth: He'd buy every cool magical item he can find and then try to replicate them for profit.
Bangor: Build a larger ranch...and go see Duluth more