30 Days of Star Trek - Day 21 - Least Favorite Character

I'm not sure quite what they mean, because even horrible characters like Gul Dukat are at least interesting. I think the nearest is Kivas Fajo in Most Toys (https://memory-alpha.fandom.com/wiki/The_Most_Toys_(episode)) because he's got no good reason for what he does and what he does is so soullessly mean.

( The other days under the cut )