#Arturia Giallo in Arknights is a good example of this

[flusterfluff]

I frequently find myself exclaiming things along the lines of "I hate this character so much as a person, it's great, they're an amazing character". Or alternatively "Yeah, no, I just hate this character. Not even as a person, they're just a flat narrative device given a voice for some reason because the writers wanted to be edgy". Quality of character and quality of person that a character is are wholly independent.

A character can still be a great character without being a good person.

In fact, some of the best characters are terrible people.

Because a character’s worth should be based on how complex and interesting they are, not their morality if they were real.