Bono

Bono was an Upir that also had a human form who rapes, kills, and eats its prey. He wanted to mate with Kate Daniels because of her powerful blood.

He can mate with animals and have monster children with them that he can control. He is also very powerful as he was able to take down a knight of the order and a vampire.

He was the one that killed Greg Feldman, Kate's guardian and the only reminder of her family left. Kate eventually puts all the pieces together and tracks him down and kills him with the help of Curran Lennart.

He was also responsible for the death of Corwin.