Yes, I decided to go and use Muscle Man's weird American colors. Also I believe the attack he is using is also one of Ultraman's major attacks (from one of those series). If anyone is not familiar with Ultraman, he's practically the Japanese equivalent of Superman, and I am pretty sure that Kinnikuman was started as sort of a parody of him (Ultraman was even mentioned in the manga).
Also, I wasn't sure whether to put this in my other fanart thread or start a new one (since it's a bit different from them and all), so if the powers that be see it fit to merge them, so be it.
Comments good; critiquing better!