I'm still working out some stuff for Gamzee (mainly a lot of his background) but what will likely be the case is that he'll be Kurloz's little brother through... ways. Who died once. And was revived by big bro the necromancer so he is now pretty much nigh invulnerable.

AKA you can't keep down the clown.

He's p. much gonna be big bro's dumb minion who doesn't question much and loves (un)life and is pretty much an ineffectual hero or villain. Who might still be able to revive like... dead puppies and shit. I am still working on that.