Out of the ones that are (relatively) alive in my game, Makoa.
Had the absolute worst first impression of the guy when I got Island Living, so I spend my time casually drowning him, reviving him, killing him again with other means etc. Sometimes I'd never see him around since my save's very much full, but the moment I find him, he's dead. Again. Then alive. Again. He lived and died way more than most of the sims I intentionally murder/bring back, and I'm pretty sure his wife already divorced him from all those times he'd peace out into the afterlife.
He's currently an old man in my game right now, but there's no way he's going to rest easy (':
I'd also say Yamachan, but there isn't much you can do against Yamachan without mods.
