TELL YOUR MEN THEY WORK FOR ME: The Joker can use Mastermind. The Joker can only transfer damage to the same friendly character until that character is KO'd.

So, the way this is worded, does it mean I can transfer damage to another character with Mastermind, who then transfers it to a different character and that third character can be different every time The Joker gets hit?

The way I read it, yes. If I continue to transfer it to that same character with Mastermind, I'm meeting the requirement for the Trait, yes?

If this works it's a nice little tactic.

Yes, that would work fine. Joker's power only limits who he transfers the damage to, nothing limits the other guy from transferring it how he wants.

I agree with your thoughts on its wording.

Nice. When I first read it, I thought you could only deal damage to that same character.
Well, Joker...meet SGT. Joker. Hee Hee Hee Ho Ho Ho Ho Ho!!