Gull Wing

The Gullwing is a Keyblade found in Kingdom Hearts II. It can be found by speaking to Yuna, Rikku and Paine in Hollow Bastion after the War of 1000 Heartless. The Keyblade is designed with wings on it, and is named after the three girls who give it to Sora, who call themselves the "Gullwings".

The Gullwing is one of the weakest Keyblades found in the game, having a strength bonus of only 3 and no magic enhancement, but it has Experience Boost as its attached ability, which enables Sora to gain increased experience if all of his MP is consumed.

Acquisition
During the War of 1000 Heartless, the Gullwings originally aided Maleficent in the hopes of obtaining treasure. After Maleficent and her Heartless were forced to retreat from Hollow Bastion, proving unable to overcome both Sora and the Nobodies that opposed them, the Gullwings were left without allies. Still wanting to be involved in the events, they took to Sora's suggestion to side with Leon after being told by Donald that Leon had treasure to offer.

When Sora, Donald and Goofy approach the Gullwings again later, they apologize for deceiving the Gullwings into helping Leon, who had no real treasure. The Gullwings in turn tell Sora that they heard from Leon how hard his journey is, and offer him a treasure chest. Inside is the Gullwing keyblade.

The Gullwing is one of the few optional keyblades in the game; however, speaking to the Gullwings after the Heartless invasion is over is a requirement in completing Jiminy's Journal.

Appearance
The Gullwing's appearence takes after the girl trio. Its keychain is the stylized symbol of "J" and "T", which originated in Final Fantasy X where it was used by Tidus and Jecht, which was then reused as part of Yuna's. It is attached to the hilt using the same type of woven string Yuna uses to tie her long ponytail.

The guard is made from two feathers that were once a part Rikku's in Final Fantasy X (attached to her boots), while the blade is made from the bows seen on the arms of her  from Final Fantasy X-2.

The strikezone of the Keyblade is quite litteraly the wing of a gull, the mascot of the Gullwings sphere hunter group.

Its apparent only connection to Paine is that it is, in its entirety, a blade, which was the type of weapon she used in her default.

Etymology
The Gullwing takes its name from the Gullwings, a group of sphere hunters that the girl trio, who gives the chain to Sora, were part of in Final Fantasy X-2.