Mass, a young duelist living in Neo Domino City. He is Forca's ex-rival, and best friend. His ace monster is Klemo, Lord of Materials. His deck is based around massive damage, defense and counters, and uses the archetype of "Material". He once defeated Forca, but only because Mass have 41 cards in his deck, and Forca have only 40. (His 41th card is "Storm on the Mountain").
Few of his card(s):
Storm on the Mountain
Klemo, Lord of Materials.
After the events of the show(...) he decides to support Forca with all his power.