If not otherwise specified/picture, you can pick which Final Fantasy version of the Aeon you wish. Here are the
Aeon assignments.
Yuna:
-Anima-2nd strongest Aeon from FFX
-Famfrit-Similar to Ifrit
-Ixion
-Quetzalcoatl-Large bird with power of thunder
-Ultima-A beast of a summons. Casts all elements at once
-Valefor
-Ifrit
-Bahemut
-Shiva
-Yojimbo
-Fenrir
-Madeen
-Phoenix
-Unicorn
Rikku:
-Angelo
-Asura
-Magus Sisters
-Mateus
-Seraphim
-Starlet
-Ramuh
-Siren
-Sylph
-Graruda (FFXI version)
Jet: (note the control over demon/hell-like creatures)
-Cyclops
-Diablos
-Exodus
-Hades
-Phantom
-Raiden
-Atomos
-Cerberus
-Doomtrain
-Lich
-Imp
-Minataur
Danielle:
-Bismark
-Eden
-Moomba
-Pandemona
-Remora
-Silf
-Cait-sith
-Alexandar
-Carbuncle
-Tonberry
-Goblin
Dart: (note- All dragons)
-Adremmelech
-Hydra
-Mist Dragon
-Salamander
-Tritoch
-Zodiac
-Leviathan
Braska:
-Ark
-Knights of the Round
-Kirin
-Kjata
-Palidor
-Terrato
-Gilgamesh
-Golem
-Odin
-Titan