The title is self explanatory.

heroes
WoL (Red Mage)
Maria
Ingus as a Monk (ex Black belt)
Edge
Galuf
Locke
Cid (FF VII)
Irvine
Steiner
Auron
Lightning

Villains
Astos
Leonheart
Xande
Zemus
Euno
Ultros
Hojo
Seifer
Garland (FF IX)
Yunalesca
Dr. Cid

Who would you include?