5. Bahamut
Bahamut is a mean looking Aeon from Final Fantasy X and by far the most powerful. If you train him properly he can easily break the hit points limit which is crucial when you are trying to defeat the Dark Aeons. He is by far the fiercest of all the Aeons and should also be the most respected with his strength and ability to squash most fiends with one hit once trained. I have classed him as a pet as he is kept by Yuna and she looks after him just as much as he looks after her. Bahamut has the best ability to use all of the magics as the ones before have been tailored to a certain capability such as Fire or Ice. Bahamut is a master of all of them and with his ability to hit through any armour as though it was not even there, he is not to be messed with.