Okay, bear with me. Geno may have been from an RPG, but it was an RPG with action elements. With that in mind, I think he could be implemented fairly accurately in SMBC. Basic aspects: FP acts as shared energy across all his special weapons, and are dropped by enemies. Geno starts with about 15. Pressing the Attack key fires pellets from his hand. Without a mushroom, these only attack a short distance in front of him, but with a mushroom their range covers the entire screen. It takes about 3 hits to kill a Goomba with these pellets. Special weapons: Geno Beam: A chargeable beam attack. Charges up to three stars in the lower left corner of the screen, but keeping the button held down after full charge leads to it reverting to its basic power. Uses 3 FP. Geno Boost: Not sure how to reflect this accurately. Maybe it powers up the basic pellet shot to do 3 times as much damage? Uses 4 FP. Geno Whirl: A quick-moving projectile. If the Special key is pressed right as it hits an enemy, it takes them out in one hit regardless of their hit points. Armor-piercing. Uses 8 FP. Geno Blast: A screen-hitting attack where beams fire from the sky. Uses 12 FP. Geno Flash: Turns into a cannon and fires a very slow-moving energy bullet that, if it can be hit with successfully, can one-shot any enemy, including Bowser. Uses 16 FP. Star Gun: Powerup for the pellets. Makes them do double normal damage, and can be stacked with Geno Boost.