The Phantom Theif is a unnamed Doppelganger and the leader of the three robbers.
Manga
He first appears when he kidnaps Tsukune and Moka. He is then seen along side with Kumocchi after Tsukune had woken up and explains to Tsukune what they do. The Phantom sees from the Shikigami that Kurumu, Mizore, Kokoa, Yukari, and Ruby are coming to rescue Tsukune and Moka. He puts on Tsukune's copy to go deal with their friends. Upon reaching the girls, the Phantom was hugged by most of them as he couldn't take it knowing that he had no intrest in girls and is weak against them. Yukari notices the Tsukune that's with them is a fake because he's not wearing the Holy Lock. The Phantom reverts back to his normal self after being discovered. He proceeds to attack the girl's using Kurumu's copy. Kurumu and Mizore tag teamed, but the two were easily beaten. As the Phantom was about to finish off Kurumu, his attack was haulted by Tsukune who proceed to attack. During their fight, Tsukune's ghoul nature got out of hand and the Phantom stopped him by showing his his copy of Kurumu's breasts with the two having nosebleeds. The Phantom comes across Moka and puts on her Inner form's copy and is able to beat all the girls, however, Tsukune placed Moka's Rosario onto his hand to seal away the vampiric powers and with the help from the attack of Kurumu and Mizore's tag team. The Phantom is finished off by Inner Moka's kick and is defeated.
The Phantom Thief is arrested and posted in the newspaper articals by the Newspaper Club.