Lamy is from Fairy Tail and in a Dark Guild named "Tartaros". When @RosePark said to choose the most annoying character, Lamy's laugh popped into my head. She has the most annoying laugh I have ever heard and she is to hyper and positive, it makes me sick!
Here's a little clip that has her laugh in it and shows a little of her personality. It's a funny clip too.
I hate the serious face she makes and she is such an aggravating character. She is obsessed with making her fellow Guild members, particularly the guys better looking each time they die and have to be made again. She has no interest in turning woman into Demons and gets mad when she meets someone prettier than her such as Mirajane! This character is overall just someone I can't stand and drives me nuts!!!