Either cannon characters, OC's or both.

My OC:
Name: James
Age: 14
Looks: bright blue eyes and a slight tint to a dark blue in his hair, quite short for his age and skinny but not weak.
Personality: easily tempered, caring, violent at times, paranoid
Other: he knows he's a demon, he can change to black flames and his demon which he can hide very well. His demon weapon is a gun that can change what type it is from a revolver to a shotgun to a sniper and so on.

Any other information just let me know