As a huge fan of Gotham myself, I am right there with you on that wave of thinking. I could easily see Bruce being hardened into a more brutal version than he is on the show, especially once Negan get's a hold of him. It would be such a fun plot to play out if Negan is there sort of grooming him in his ways, while Alfred is trying to keep him grounded. Alfred's a tough old bird, so he'd survive just fine in the sanctuary I feel. He's got his own hardness to him that Negan would admire and even respect, as long as he didn't push his luck with him. Though Alfred's pretty smart about picking his battles.
Carl may just have some brooding competition with Brucy here haha. Carl's lost a lot, but then Bruce has lost even more. It would be interesting to have them on opposing sides to start off. Cause I mean, Bruce could always switch sides if Alfred's talks start to sink into him. I just got this mental image of them fighting, or having a stand off with guns, only to find out how evenly matched they are. Though once they started talking I think Carl would see how similar they really are.