Uh, no?
Torture and dislike doesn't have a place in a (good) fanfic. A (good) fanfic writer should write with fairness, without using characters based on his/her own bias.
If the choice is "I either torture this char I hate or I make him disappear into the Void", you're just doing it wrong.
Of course, you can work things around in order to not have a character you don't like disturbing you. But, for example, you can't just sign Sakura as "Lady-not-appearing-in-this-fanfic" just because you hate her. You can have a fanfic based on Fate or UBW route where she doesn't have a major role though.
Oh, this of course.