Yeah okay BEDWETTER, we believe you.
1) Genesis Rhapsodos
Before becoming a more fleshed out character, Genesis was known only as G in Dirge of Cerberus. He should be the most popular representative left to debut for FF7.
2) Warrior of Light
A theme in Dissidia 012 for this character was his lack of a name, and it is revealed he may actually have one. It is never actually revealed however, so he continues to go by this alias. Theoretically, a potentially popular character based on FF1 nostalgia as well as new generation storytelling from Dissidia
3) Shelke the Transparent
All Tsviets are technically using aliases, but the best character among those is right here.
4) Amarant Coral
Contest journeyman and beacon of hatred for some, the Flaming Amarant is nevertheless a playable character and could very easily survive boot rounds.
5) Gogo
A source of mystery to some (apparently that number if few for some reason), Gogo stands as one of the few playable characters from a main numbered series games to never make this contest. Certainly Gogo is an alias; what its true nature and name is will probably never be known.
Honorable mention: Elfé
I've only read about this Before Crisis character, but what I have read I really like; maybe some day Square will port the game to the 3DS
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Still smilin'
:>