Most people would say Minmay from Robotech. I've watched very little of the show, but from what I've seen, she is indeed a stupid bitch.

A character that I am more knowledgable about would be Tenchi from Tenchi Muyo. I've seen a few more episodes of it than I have of Robotech, and I've never wanted to vomit more violently in my life. All of the characters were awful, but Tenchi himself was the worst. Easily the most worthless half hour tripe-a-thon I've ever had the displeasure of being forced to sit through.