Day 2 is least favorite character. And mine is Jellal. (I'm excluding characters who are purposely annoying like Ichiya and stuff since those would be easy choices.)
Some of my hate for Jellal might stem from the fact that everyone ships him with Erza and I do not. Don't get me wrong, I thought Jellal was a great villain. And in fact Tower of Heaven is my favorite arc. I just hate that he had to come back as a good guy. When a villain is done so well they should stay a villain. He can return as a villain or help the heroes for his/her own agenda. I'm just annoyed every time he comes on screen and wish he would die or something. If any character should die in the series I think he should be one of them. It would make a lot of sense anyways.
So that's my least favorite character tell me some of the characters you hate in the comments below! Have a good day! Ja ne