Oh, also, I guess if he has sex we would come back to your suggestion of the impotent anal slut (which is still a super hot idea n I hope you’ve time to wrote it ~); if allmight really wants to be intimate I guess him being the bottom might be the safest option? (Still no kissing though n condoms are mendatory I guess. No cream pies for allmight. …)
that question actually gets answered late into S2! posting the answer below the cut if you want to spoil yourself or not
he can only transfer his powers if he wishes to do so. he can forcibly give them somebody else, but they can’t be taken forcibly or by accident. He has to actively make his mind up to do so