Here are some characters that are forbidden to use BEFORE level 15:

-All The Green Lanterns
-All The Black Lanterns
-All The Red Lanterns
-All The Blue Lanterns
-All The Yellow Lanterns
-All The Purple Lanterns
-All The Indigo Lanterns
-All The Orange Lanterns
-All Kryptonnians
-All Amazons
-All Main X-Men
-Namor
-Magneto
-The Fantastic 4
-Mon-El
-Dr. Light
-Vixen
-Animal Man
-Firestorm
-Iceman
-Colossus
-Shadowcat
-Emma Frost
-Supergirl
-Power Girl
-Superboy
-Donna Troy

(List to be completed, these rules do not apply to moderators or first 14 forum members)