Cameos, eh? Nice idea.
Sprite:
Just "Cid" will do for the name, and any role is fine by me. If you have something that fits the look then go for it.
Failing that, make him an NPC adventurer standing somewhere out in the wilderness. When (or if) you meet him, he tells you he's tired of a life of fighting, hands you a piece of equipment (nothing fancy) and says he's going home for a cup of tea.
A glorified treasure chest, basically.