Just for the record, we have guessed the following things:
Hojo
Weapons
Zemzelett
Don
Red
Mr Coates
Jenova
Bone Village
Carbot Nut Island (?)
Chocobo Sage
Cait Sith
Vincent
Lifestream
Rocket
Meteor from logo
Rufus
Heidegger
Bahamut Zero
Reeve
Scarlet
Mako Pit
Palmer
and Sephiroth
We know it's not an item, not a monster and not a continent:
So it can be a character of a town/city/landmark?
~ and on top of that, it has got to dow ith green and white... !?