As an Unversed who feeds off of negative emotions and a manifestation of pure darkness, Vanitas is cruel, twisted, and quite possibly insane—simply put, he is pure evil. The lives of others hold no value to him, and he would kill without a moment's thought. He also possesses a high amount of pride, believing himself superior to others in every way, and is not above betraying his own master if the situation calls for it. This is in stark contrast to Ventus and Sora and other beings connected to their hearts such as Roxas and Xion, who are all kind, gentle, and valiant people who cherish their friends and possess overall heroic qualities.
Vanitas's Keyblade is a Keyblade used by Vanitas in the upcoming prequel Kingdom Hearts Birth By Sleep. His Keyblade takes a strong resemblance to his Master's Keyblade and appears to hold great strength in magic attacks. Its token is a gear that has been cracked into two pieces. The teeth are black with a red outline and possesses a round, cog-like shape. The shaft has various metal shapes, one most prominent is a gear in the centre, with a chain wound around it. It also has blue eyes that were previously unique to Riku's Soul Eater and Way to the Dawn; one located near the tip of the shaft and one embedded in the guard.