Rebekah & Vanity
For quite some time, one of her big personality traits in the TVD seasons of her, was her vanity in just about everything. I like how she kind of grew up, but I feel like they ended up at some point in time just forgot that it was part of her character... Heck, loved it when Klaus even referred to her as petty, vain thing - when at that point, it was true :)
My favorite character regardless though.
__
http://www.imdb.com/board/bd0000082/nest/265732966