Re: WWYCD: My Good Enemy
The Flying Kittens: Have a little quandary as their recurring enemies are all old enough to be their parents (and two of them are the Kittens' parents).
So, for the evidence to make sense, the new kid would have to be either a) a future sibling, the grandchild of one of the other villains, or c) the child of a villain the Kittens have yet to meet.
In any case, they'd be highly sceptical of his(her) story, but would go rescue the kid anyway.
Luna Moth: Has only two recurring headaches: the police (specifically the task force her father leads) and the local Demonhame. (The local heroes consider her as their grey/black market contact; due to the fact that she's training their youngest three how to fly, and that trio is the team's only aerial members.) While I can see her shacking up with a rookie cop, it is highly unlikely that she would give up her thieving ways until/unless the curse of the Medusa Tear has been lifted from her.
In this case, the obvious kidnappers will be DEMON, either as bait or because the kid brought a highly magical artifact back with him. And Luna Moth (with the local heroes as backup) would go after them.