Ted, Luke, Bart (was that his name?).
I think three of his lovers/wives died (Luke, Ted, Claudia). Can't remember how many died for Fallon or Adam or Amanda.
This must really read as boring...
I sometimes wonder, given Billy Campbell's obvious appeal, if he'd been kept around longer, what would have happened. I'm sure he would have been popular with viewers. They probably would have magically turned Luke bisexual. Still, a scenario where he became close to Blake, like a son, and both Steven and Adam were resentful about it and Adam was all, "Now you know how it feels," and Steven is all, "What do you mean, idiot? He never liked me either," and they melodramatically brawl and then plot with Alexis to overthrow Blake while Luke sided with Krystal and Blake and Dominique and whoever else - I would have been entertained.