Probably any of the Superfriends already not tapped into for a ride...
Maybe The Flash for a hypercoaster? Wonderwoman would have a great non-existant/existant ride if they use her invisable jet as a theme for a ride: "It's there, I swear! You just can't see it because it's invisable."
How about those 2 Spongebob heros... Mermaid Man and Barnicle Boy! ------------- The Great Escape... Soon to become Six Flags Adirondack Escape!!!
*** This post was edited by Dawg Byte on 7/8/2001. ***
Definetly Aquaman, The Flash, and Green Latern. Hell, they were just as much as part of the League of Justice as Superman, Batman, Robin, and the others were, lol. If they are gonna keep themeing rides after super heroes, the least they can do is bring some of these superheros in the picture!
How about no more super-hero named coasters! The parks are just getting lazy with naming them (ahem, Six Flags) so they should come up with real names. In 5 years, more coasters will probably be named after a super hero than have a name that a coaster deserves.