Urkonn of the D'Avvrus

Urkonn was a demon sent to train Melaka Fray as a Slayer after her Watcher chose instead to immolate himself. Serving as her guide and confidant, a budding friendship grows from the what begins as a rather harsh mentor-student relationship, but he ultimately betrays her in order to harden her resolve and kills Loo. After defeating her brother, Harth, she discovers Urkonn's betrayal and lures him into a trap, killing him.