[quote=@Nib]
I've compiled a list of possible characters to play and am open to suggstions:
Nightwing
Green Lantern - Hal/Kyle/Dick Grayson/Alan
Dr. Fate - Maybe as Alan Scott
Moon Knight
Gambit
Cyclops
Swamp Thing
[/quote]

I am personally very against the idea of Dick Grayson at all given that Batman is still in year one, or rather the entire RP is. 
Green Lantern's are always nice to see. Not sure what the justification for making Alan Scott into Fate is, seems like an unnecessary change to me, but maybe the concept is better in reality.

Moon Knight is always a cool character.

Of all the X-Men, Gambit I think works the best alone whereas Cyclops I feel like you'd need to build up the rest of the X-Men which is fine if you want to do that of course.

As for Swamp Thing, I have no particular feelings on the character.