Personally, I don't think he needs it. Why would you go in swinging with uncharged punches, anyway?
Sure, his fists may be pathetic in speed, but he has something other Superheroes lack: An effective ranged attack.
The Cozmic Beam deals massive damage at any range and doesn't overheat for quite a while. It should be your main weapon in most situations, even up at close range.
The fists, on the other hand, are usually situational. Their main use should be making important enemies unrevivable. These usually include Sunflowers, Citrons, Corns, Roses (in an Herbal Assault game), and maybe the occasional Torchwood.
A fully charged punch is not enough to vanquish anyone from full health with the exception of a Vampire Flower (given you have the damage upgrade and they don't have the health upgrade). You would need to weaken the target first, or have a teammate do it for you. It is definitely worth it to "banish" an important foe for several seconds, especially if the Plant team has some Sunflowers who focus on revival and healing. If your target isn't weak enough to banish, but you have your Heroic Kick, you can always hit them with a fully charged punch and follow up with a kick, instantly vanquishing lower health classes, and severely damaging most others.
It's dangerous to head into a firefight, expecting to vanquish multiple enemies. You should either stay back and use your laser from at least a medium distance for spam, or be sneaky, weaken unsuspecting enemies with your laser, use the Heroic Kick to close any distance between you and your target, then banish them with a fully charged punch when they're low enough.
You could also get risky, heading straight for some enemies while charging a punch and jumping around to make yourself hard to hit, throwing your powerful punch when you get close enough. From there, you can use the Turbo Twister, which is usually enough to finish them off. I highly don't recommend trying that, though.
Cozmic Brainz is by far my favorite character in the game. Not my most played character, but definitely my favorite. And as much as I would like to see him throw some stronger punches, I really don't think he absolutely needs anything at the moment, given the powerful range his galactic bracelets give him.
