Sorry, there aren't many, and don't even try MarvelMods.
The folks at Marvel, Raven Software and Activision have been good enough to look the other way when we convert things from the X-Men Legends games to Marvel: Ultimate Alliance and vice versa. They probably realize that modding helps PC sales, and that often ideas for a game's sequel can spring from mods for the first game. That being said, we always welcome Marvel-to-Marvel conversions, as our ideas can become the springboard to creating new games.
That being said, using other franchises such as (but not limited to) DC, Dark Horse, LucasFilm (Star Wars) are not allowed here at MarvelMods.com. We have a great thing going here, and we feel that it's smart not to 'rock the boat' so to speak by having other companies come in and try to shut us down due to not liking their characters in a Marvel universe. There have been a few characters that have slipped through the cracks here and there, and if you have them, we ask that under no circumstances do you share them with others. Would they really shut us down if they found their characters in a Marvel game??? That's just it, we don't know. But it's better to be safe then to go to the site one day and find out it's been shut down. Additionally, any non-copyrighted character that has been published (for instance, in a web comic) is also off limits.
Completely original characters are always welcome, and always will be. There haven't been many 100% original characters created, but they're totally safe, as they're your creations. However they must be 100% your work, and no one else's. Violating this policy will have severe consequences."
Although, you never know what you might find in