B'foris B'farius - Sinestro 2814

B'foris B'farius was one of the White Martians that came to Earth and nearly destroyed the Justice League, but was foiled by them and brainwashed into living as a normal human being. However, following the events of the Sinestro Corps War, a Yellow Power ring sought it out, restoring its memories of its past life, promising it would aid in revenge against the Green Lantern which had first stopped its plans - Kyle Rayner.

However, this came at the price of a contract: B'foris would first have to seek out and kill the newest Earth-bound member of the corps, Chloe Ming. It has since proved to be one of Chloe's most devious and dangerous foes, with the Power Ring's abilities, mind-reading and shapeshifting at its command, and a deep-rooted vendetta fuelling them all.