It’s a rather complex question. Each character, even those who appear less frequently in videos (where their behavior can be observed) or quests, such as Hangwul or Tralsai, etc., has their own personality and performs certain actions, which shape the feelings of like or dislike.
Personally, among most of the characters, I dislike Erazeal, Wier, and Laslo the least. The first two are puppets of the ruler, unable to faithfully carry out orders, and the third, although his mind is clouded to an incredible degree, is still one of the commanders of the imperial army. And he should be aware of his actions (or at least Biara, who controls him, even indirectly) – that it would be easier to try to negotiate with Nicholas’s nephew than to simply force the issue. But no – they have to create a senseless bloodbath and push their “goal” even further away.
In general, it’s clear that Laslo is the character I like the least.