Vanitas Remnant

The Vanitas Remnant (ヴァニタスの思念, Vanitasu no Shinen) is a minor antagonist and a boss in the video game Kingdom Hearts: Birth By Sleep. It is the physical manifestation of Vanitas' thoughts, emotions, and will.

He was voiced by Miyu Irino in Japanese and Haley Joel Osment in English, both of whom also voice Vanitas and Sora in the same franchise.

History
After the initial destruction of Vanitas, a final Unversed was created, this one being the most powerful one and a physical manifestation of Vanitas' negative thoughts and emotions.

The Keyblade wielders Ventus, Aqua, and Terra can travel to the Keyblade Graveyard's Badlands, where they will encounter a powerful dark energy. Upon inspecting it, a portal will open and the Vanitas Remnant will emerge and attack. The Vanitas Remnant has all the same abilities as Vanitas, including teleportation, Fire, Cure, and Thunder magic, durability, and incredible speed and strength. It also gains many dark abilities, such as creating dark clones, dark shields, and firing energy blasts. It attacks with all of these moves at blinding speeds, requiring intense dodging, blocking, and focus from the wielder. When it is finally defeated, it disappears back into darkness, possibly destroyed. In the Final Mix version of the game, the wielder will obtain the Remnant's Void Gear Keyblade and be given access to battle the Mysterious Figure.