something to think about with the G.I. Joe comparison on the names. Not every character's name get's revealed for example:

Snake Eyes is listed as "Classified"
Jinx is listed as "TOP SECRET" (Though the comics later revealed her name to be Kimi Arashikage)

Strangely some of Storm Shadow's file cards list his name as Classified when previous cards gave his full name (Thomas S. Arasikage)

Other characters (villains) are simply listed as "Unknown" or just left blank. So everyone has a real name but not all of them are revealed. The closest we've gotten in the MOTUC bios is Faker who's listed as N/A (meaning Not applicable)