(I should probably introduce this guy into the story so then we have more assistance.)
Name: Zarathos Cotheran
Hero Name: The Vengeful One
Species: Half human half Demon.
Age: 23
Appearance: *Right on the image* He is mostly human when you see him. Until he transforms of course.
Powers and Abilities: He is an Agent of Brimstone. He can transform into a full demon with seven mouths. Uses brimstone like Marcel but has more control and can make Constructs with it.
Personality: Zarathos is a very determined person and can keep his mind on one objective at a time. Sometimes he may need to multi-task different things to the safety if others. If someone messes with someone close to him though he becomes a vengeful person. I.E. his title as "The Vengeful One."
Way of Application: Is this necessary?
Important Traits: He can easily lose control if a villain hurts someone critically.
Crush: Hornet?
Other: He likes nicknames like "The hand of Thunder Quacks" or "The dark Thunder Quack." A certain band Marcel likes made a song with the exact same name. And Zarathos became inspired to become known as The Vengeful One.