THE ANOINTED ONE. BtVS Demon/Monster/Villain.

A young boy (his real name is Collin), whose appearance--"he will rise from the ashes of the Five on the evening of the thousandth day after the Advent of Septus" ("Never Kill a Boy on the First Date")--and role in the death of the Slayer--"The Slayer will not know him, and he will lead her into Hell" ("Prophecy Girl")--was predicted in the writing of Aurelius.  In Season One he becomes one of The Master's chief minions and briefly succeeds him as a leader until killed (locked in a cage and raised into the sunlight) by Spike ("School Hard"), who calls him "The Annoying One."

--David Lavery