I made a character in DCUO and played trough the entire storyline with Batman as mentor. Since it was my main character and I liked the powerset I remade my character in City of Heroes. Note that this character is from Gotham and was mentored by Batman, and is an offical member of the Justice League. That is trough me playing trough the game with that character. Story is then that she was transfered from Gotham City to Paragon City to help out there. However my character is not based on an existing DC character, but is my own DC character from the online game DC made. It would be like if you remake and everquest character here. That is allowed, so remaking your own character and using IG storyline you played trough from a different game should be allowed.
Nothing preventing you from remaking your own characters, right?