i want rabbit!adrien so bad but i need him to be a freak, hold on let me explain
obviously, he doesnt get the cat miraculous, somehow get the rabbit (dont ask me) and obviously.... he kinda abuses it. he doesnt do harm but its not like hes doing good
he doesnt change anything about the past but he will absolutely find out everything he possibly can about everyone he's ever met by their past, and then pop right back in the moment so no time has passed.
first time meeting him is fine and the second he will mention he knows where you sleep and what all your secrets are
the other heros know of his existence (in costume, i assume he doesnt go to school (so hes more freakish/not knowing how the fuck to talk to people)) and they all think he's weird, he can be helpful when they need it most, but generally, he's not there to help, he's there to observe and comment