Nope, never saw Meteor Man. Captain Stupendous, as I see him, is Superman as played by a typical Will Smith character. His name is a nod to Stupendousman from Calvin and Hobbes. Incidentally, Stupendous's secret identity is Calvin Lane, which is a double nod--Calvin, of course, being another nod to Calvin and Hobbes, and shortening his first name and taking his last initial gives you Cal L, an obvious nod to his main inspiration.
And the color scheme is only for the founding 3. The green guy you mentioned is the Grasshopper. Some of the other heroes who'll be appearing soon will add more colors to the mix, so I'll hopefully avoid any kind of color monotony. Regardless, your feedback is appreciated, since this is exactly the sort of stuff I need to keep in mind when designing characters.