Xirbealg

Xirbealg is the nobody of Gabriel (and is unaware that when he was whole he was the son of Riku) and the wielder of both the keyblade of the (a counter-part to the ) and controller of  and. He has searched endlessly for a meaning for his existence and has been able to create 2 keyblades of his own as well as learned to wield his father's.

Birth
After living on Destiny Islands for 13 years he discovers he is able to wield Riku's keyblade, his father had been dead for 4 years but at the time at which he died his keyblade was used as a tombstone. Gabriel wanted to travel the worlds and find a new family but when he left to The World That Never Was by traveling through the corridors of darkness he was attacked by a twilight thorn and even after putting up a fight with his late father's keyblade he was turned into a heartless by trying to overuse the power of darkness. His nobody was immediately born In Twilight Town.

Creation of his keyblades
After living in the Old Mansion of Twilight Town for 2 years he fully mastered the use of both light and darkness. He then used both elements to create his "Dawn of Twilight" keyblade along with his Road to Revolution keyblade. He then mastered dual-wielding both of them in various simulations he created in the mansion's computer room.

Now
Xirbealg has since left the mansion and started looking around Twilight Town

Quotes

 * I may be a nobody but I still exist

In Battle

 * I don't care if the darkness overwhelms me I will destroy you!!! (while fighting the Twilight Thorn while still whole)
 * I won't be defeated
 * Face the Light!
 * Darkness!
 * The power of the Dawn is stronger than anything you will ever imagine!!!