Gatchaman seems to be pretty well represented. I think a gang of traditional Yokai based on the bunch that was running around saving people in Karas would be a neat character...like the umbrella, a pair of geta, some other yokai connecting it together. Or, for something simpler, Nue the Cool Guy, the female Karas, or the gigantic bull demon mikura from near the end...a good match for Lightan.
Maybe Tekkaman Blade to have another version that isn't so portly looking?
Or...how about Speed Racer?
Judo Boy? Then they could add Sagat and Judo Boy could have HARSH WORDS FOR HIM.
Generator Gawl?
For Capcom...Bionic Commando. A Star Gladiator, preferably either Gamof or Zelkin, though Claire would be OK too. If they can put Lightan in, why not Kikaioh from Tech Romancer?