I love the minions. Sure they're purely aesthetic but they're awesome. With the release of the Minions of Light, it gave me some ideas of what else the Devs could turn into a minion.

Frog/Glenn from Chrono Trigger
Robo from Chrono Trigger
Rocket Slime from Dragon Quest
Gestalt modes from XIII
Moombas from VIII
PuPu from VIII
Chibi Heroes and Heroines (looking something like the thatRhythmFF sprites)
XI Dragoon Wyverns'
Einhander
Ivalice and crystal chronicle Moogles (or traditional moogles -- why hasn't this happened yet?)
Shadowlord from XI
Gogo from VI
Palom and Porom from IV
Nu Mous, Vieras and Bangaa from XII

Feel free to add in.