I actually had to look up what a yandere is on TV Tropes (it's a cute, but psychotic character). Then I also checked which characters qualified as yandere. Based on what I read I would consider Nanami from Revolutionary Girl Utena the best. She's completely devoted to her brother, even going so far as to kill a kitten when he paid it more attention then her. I don't really know why I like her character so much, I mean, she's psychotic about her brother and pretty much a bitch to everybody but him. And still, her character-centric episodes are simply hilarious and I truly felt sorry for her when Touga jerked her around and used her.
