Anya! About two episodes make me cry, and all because of Anya.

The Body: I always cry during Anya's monologue in Willow's dorm room.
Chosen: I always cry when Anya . . . well, you know. I don't even wish to speak of it.

Also, Xander leaving Anya at the altar put him on me "You're Dead To Me List" which currently houses Lee Adama and Sarah Palin.