Superhuman stamina, agility, and reflexes, Cross-Earth awareness, Extended longevity, Master swordsman
He was born into a rich family. He was just the shy quiet little kid that always was in the back of the room. But when he turned 13 he became very violent. He was ready to attack anyone for anything. When he was 14 he learned that he has two personalities. One nice this is when not in his fighting gear. One violent when he is angered or fighting. Once an ambassador made him mad and he hunted him down as the Mad Demon. He still has the mask and swords that he used even though he gave up that part of his life. He found a pamphlet and went to the academy.
He is usually nice but is always on the edge. Sometimes he is angered very easily and others he keeps a cool head. Only 2 things can stop his ramgage. One is a word that only Jace knows so others cant use it against him. The other is if he is knocked out.
Mind readers. They creep him out and if they are in his mind, he knows, they know his stuff about his past ... Its just not good.