Final Fantasy Compendium

The black-scaled King of Dragons is nearly always one of the most powerful summons. His primary attack, "Mega Flare", does non-elemental damage. Generally, he is one of the most difficult monsters to beat in order to get him to join you. In FF1, he appeared as a non-summonable character, who upgraded your class if you gave him the Rat's Tail item. In FF4, he was the God of Summons. He's such a popular character that he merited his own strategy/RPG game for SNES - Bahamut Lagoon.

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FF1 NES in-game FF1 PSX in-game FF1 (NON-SUMMONABLE CHARACTER)
-Bahamut

Bahamut rules the dragons in the Dragon's Cave, and will upgrade your class if you gave him the Rat's Tail item.
FF3 in-game FF3 in-game FF3 in-game FF3
-Bahamut
ATK: Megaflare
FF3 in-game FF3 DS
-Bahamut
ATK: Megaflare
FF4 in-game FF4
-Bahamut
ATK: Mega Flare

Bahamut is the God of Summons, and resides in the Cave of Bahamut on the Moon.
FF5 Overworld FF4 in-game FF5
-Bahamut
ATK: Mega Flare
FF6 in-game FF6
-Bahamut
ATK: Sun Flare
FF6 Advance
-Bahamut
ATK: Mega Flare
FF7 Bahamut in-game FF7 Neo Bahamut in-game FF7 Bahamut Zero in-game FF7 Bahamut Zero in-game Bahamut concept art FF7
-Bahamut
ATK: Mega Flare
-Neo Bahamut
ATK: Giga Flare
-Bahamut ZERO
ATK: Tera Flare
FF7AC Bahamut SIN FF7AC Bahamut SIN FF7AC
-Bahamut SIN
ATK: Mega Flare
Summoned by Kadaj.
FF7CC
-Bahamut (ATK: Mega Flare)
-Bahamut Fury (ATK: Exaflare)
FF8 in-game FF8 mid-attack in-game FF8 face FF8
-Bahamut
ATK: Mega Flare
FF9 in-game FF9 in-game FF9 cut-scene FF9
-Bahamut
ATK: Mega Flare
FF10 in-game FF10 face FF10/X-2
-Bahamut
ATK: Impulse (Special Attack), Mega Flare (Overdrive)
FF11 in-game FF11 in-game FF11 (NON-SUMMONABLE)
-Bahamut
FF12 in-game FF12: The Bahamut is a giant warship, the final dungeon in the game. In addition, the final boss, The Undying, bears a huge resemblance to Bahamut. Vayne and Venat merge with parts of the Bahamut to create a giant metallic dragon (complete with a dragon's head above Vayne's). The Undying's attacks are Megaflare, Gigaflare, and Teraflare, and the eye color and even camera angles during the attacks seem to be a tribute to FF7's three Bahamut versions.

CP: No. 1 Sky Fortress Class Airship. Belonging to the Western divisions of the Archadian Imperial Army, a mobile fortress and tactical base, under the control of the commandant of the Archadian forces, Lord Vayne. This was the last sky fortress designed by Dr. Cid, powered both by ordinary skystone and manufacted nethicite, the latter absorbing Mist from its surroundings to generate the massive amounts of energy the fortress requires to function.
Tactics
-Bahamut
ATK: Megaflare
FF12RW
-Bahamut
ATK: Mega Flare
FFU FFU Unlimited
-Bahamu (not named)
SOIL: Marvelous Orange + Maniac Purple + Ultra Shocking Pink
(V2) Tear Rainbow + Endless White + Soul Steel Gray

Although never named outright, it is evident that Bahamut is the identity of Kaze's ultimate summon.

Final Fantasy, all games and animation bearing the Final Fantasy name, and all characters in said games or animation are copyright their respective creators, including but not limited to Squaresoft, Square Enix, Square EA, Tokyo TV, and ADV Films.