Yeah I know of that one dialogue, but I mean someone who really makes it truly difficult to get it back or even going as far as to punish the player for even trying to get it back, unlike Rinny who is just, like "aw shucks, fine I guess you can get it back" after barely any struggle
I don't think there is anyone. Again, I could be wrong because last I played was *several* updates ago (I almost forgot if if it was Rinny or Rinni) but to my knowledge, every character you can give the key to just gives it back immediately. There *could* have been a change or a new, more punishing character added to the list of candidates, but I doubt it.