World Population Status (October 10, 2013)
Crowded Worlds

Alexander, Behemoth
Anima, Cactuar
Atomos, Excalibur(LEGACY)
Carbuncle, Hyperion(LEGACY)
Fenrir, Moogle(EU)
Garuda, Ultros
Ifrit,
Ramuh,
Tiamat,
Titan,

Uncrowded Worlds


Asura, Coeurl
Belias, Brynhildr
Pandaemonium, Faerie
Unicorn, Famfrit
Yojimbo, Goblin
Zeromus, Lamia
Lich(EU),
Malboro,
Mateus,
Siren,
Zalera,

You will be hard pressed to find anything more recent and accurate. feel free to look.