Leader of Eris
He is a terrifyingly-intelligent strategist with an uncanny ability to discern people's emotions and motivations, and is both a consummate liar and a master of manipulation, always knowing exactly what words to say to which person in order to get the reaction he wants. He is also narcissistic to the extreme, believing himself to be inherently-perfect and beyond reproach, and that he is incapable of doing wrong; this can be seen as a weakness. Despite his arrogance, however, he is very cautious, never directly interacting with anyone but a select few trusted aides -- instead conducting much of his business via remote communication from an undisclosed pocket universe -- and keeping his true whereabouts carefully-guarded.
His most immediately-noticable trait is his eerily-perfect, idealised appearance, lacking even the minor physical deformities or blemishes that are normally present on most people. It is likely that he underwent extensive plastic surgery to achieve this.
He usually displays an unshakably-calm, affable demeanor, never showing any trace of anger, anxiety, or aggression unless he believes it will get a reaction out of someone.