Just my thoughts on what the customizable options should be:
B: Guns: One short range, one mid range, and one long range. They aim like in the game.
- Mega Burst Gun: Long lasting rounds for trapping.
- Gatling Gun: High fire rate for screen control.
- Dragon Gun: Good homing for pressure.
Side B: Bombs: can move the cursor up, down, left, and right. He can hurt himself.
- Standard Bomb: medium speed, average arc, medium damage.
- Submarine Bomb: slow, no arc, big damage.
- Tomahawk Bomb: quick, high arc, comparatively less damage.
Down B: Pods: used for trapping and screen control and in the rare case recovery, Samus and Link style. He can hurt himself with them.
- Spider Pod: homes in on nearby opponents on ground only. Three charges.
- Satellite Pod: homes in on nearby opponents in the air only. Three charges.
- Acrobat Pod: Simply for easy recovery in exchange for no screen control. One charge.
Up B: Air Dashes/Legs: depending on the leg you choose, your air dash Up B will be different. Gets 2 air dashes under normal circumstances.
- Long Thrust: Longer air dashes.
- Quick Thrust: Quicker air dashes.
- Plus One Legs: gets an extra, normal air dash.
As for why Charges aren't a special, I'd make the normal Ray charge a forward smash, an anti air charge the up smash, and an in-place charge for down smash. They'd maybe have invincibility frames like in the games, but that might be OP.