Way ahead of you here. I think I mentioned in the old forums I already have a design for The Agent if we ever get to do it.
Essentially has 4 categories of ability at 3 levels: Agility (jumping attacks), Strength (melee hits), Guns, and Explosives.
Starts really weak, but every time you successfully hit the opponent, orbs fly out and you level up your abilities over time by collecting them. Essentially, you only have access to the equivalent of light specials at first and weak jumps, but as you level, you get access to medium and heavy ones, ground pounds, etc. His heavy powers hit HARD.
Focus on one category first, or spread out – depends on your opponent and play style.
Wish +1: Include the Voice of the Agency as an announcer.
Note: THIS IS ALL SPECULATIVE – I can dream too, right? 