I absolutely hated FFX's Bahamut. Its got rainbow wings and is real bright. I mean come on, every other design he was this sky "King of GF's" who was 2nd best at worst. They really messed him up and not only are many other Aeons in that game better then he is... he exhales rainbow bursts as a megaflare. WTF

EDIT: Although the worst is those summons who attack the party members too. Cyclops {cough,cough}