Can't...pick...one. :O_O:

Humans: Aeris, Cid (VII), Cid (VIII), Cid (Tactics), Quistis, Tifa, Vincent, Locke, Celes, Rydia.

Summons: Diablos, Shiva, Ifrit.

Monsters: Rubicant, Emerald, Ultima Weapon (VIII).