Damian Hart is the leader of Team Star Breakers, representing America in Beyblade: Metal Masters. He's one of Gingka's rivals and his Beyblade is Hell Kerbecs BD145DS.
Damian has round blue hair and a small streak of green hair with some points sticking up from the back of his head with light-blue hair. He has pointed green eyes and blue eye-brows. He wears a small black belt around his neck and wears gold armor with yellow clothes along with gray chains.
As HD Academy is shown for the first time, the scientist, and leader of the organization; Dr. Ziggurat is using a device called the "Arrange System". A boy named Damian Hart is shown inside one of those capsule devices, which is brainwashing, and infusing power from Hell Kerbecs into his body.
After Dr. Ziggurat finished his work on him, he sent Damian to bring Ryuga back to HD Academy, and to test out his new power. At a Beystadium somewhere, he interrupts Tsubasa, and Yu's Beyblade race. He tells both Tsubasa and Yu that he wants to test out his Bey against them, which they accept. Not to long after, an explosion is seen in the background during Masamune and Zeo's battle at the park. Gingka and the others rush to the scene. Upon arrival, devastated, and shocked by what they see... Tsubasa and Yu are majorly injured, and unconscious, along with their Beys which have suffered a devastating disaster as well. As he defeated Julius, Wells and Sophie appeared that Kerbecs came out of the gates of hell. Damian may be the only Blader more powerful than Ryuga, but at the current events, Ryuga is "concealing" Meteo L-Drago's full power. In Episode 100 he is defeated by Kyoya.