For many years I was PhantomPen on every site I joined, then (for a variety of reasons) I decided that a new persona was in order and I started using Boadicea -- because she was fond of burning people and had a cool chariot. Then I got tired of people (Americans mostly) asking what "Boadicea" meant, so I changed to Fantastic Freya, which just confused them even more and finally I decided it was a hell of a lot easier to just use my actual name.
Lannister hater comes from the name taken from george r martin's A Song of Ice and Fire series. The lannisters are a family that is ruthless and rich. They are the antagonist in the series, therefore, the hater part of the screen name. My favorite character in the books IS a lannister, Tyrion, but he hates his family too. My avatar is also an artist's rendering from the novels.
about 6 years ago i joined an online game called Runescape... (most ppl know what it is) and i came up with my username randomly and it stuck, so now thats my name for everything, email, youtube, facebook, ps3, xbox, WoW, and all that shit.