I hope that there will eventually be a Slaver Champion

We have a few Champions like Xin Zhao who have been slaves in the past (though Xin's story might get retconned), but so far we don't have someone who actually enslaves people. It'd be interesting to see a character who breaks other people into becoming thralls, whether through beatings, cruelty, or other means.

Hey, Star Wars Clone Wars pulled it off with the Zygerrian arc, so I don't see why Riot couldn't pull it off. And there's already slavery context in Xerath's lore.

ITT: Thresh and Mordekaiser don't count, as Mordekaiser doesn't capture that vibe properly, and Thresh is "the torturer".