The Bahamut's body consists of a crossbow-like shape, silver in front and black on the inside, with two Nobody spikes on each side. There are two purple diamonds on the stock, tip-to-tip. The back end of the Arrowgun is a grey arrowhead. The barrel is a short, black arrowhead, which fades to white as it nears the tip, with two holes, giving it a similar appearance to the Nobody insignia. The handle and guard, which is lined by six light grey diamonds with black edges, are both light grey. The bullets are yellow and the diamonds flash this color when Xigbar reloads. They produce green sparks upon striking an enemy, and gold sparks on contact with anything else. The Bahamut Arrowguns resemble Braig's original Arrowguns.
Bahamut is named after the summon, Bahamut, one of the Final Fantasy series' most famous summons. A great and powerful dragon appearing in nearly all of the main Final Fantasy games, Bahamut sometimes appears as a plot device. His signature attack, Mega Flare, appears as a recurring, Fire-type attack in a number of Kingdom Hearts games.
The basic ground attack consists of Xigbar combining the Arrowguns into a sniper rifle and firing three shots simultaneously (four shots for Bahamut+) in a wide arc. This combo functions akin to the spread of a shotgun, as the bullets are rendered useless after traveling a certain distance. When executing an aerial attack, Xigbar flips up and stands upside down while firing three shots straight downward (four shots for Bahamut+) from his combined Arrowguns.