Damien seems like a fantastic character, but I can foresee Allen having some problems with it. He has:

1. Empathy
2. Empathic empowerment
3. Manipulation of emotion
4. The manifesting energy can have acid effects,
5. fire effects,
6. and lightning effects
7. Technopathy
8. He has a fucking cannon on his arm
9. He has a telescope in his eye

You're dipping your hands in three unrelated fields of powers, it seems. The technopathy and cybernetics would be fine on its own (you might have to change the history a little, and, of course, the arm-cannon). Damien just seems like an overloaded anime with all of these powers.

But I do want to see you play this character. If you need any help, don't be afraid to ask.