Tatsuya (タツヤ) appeared in episode 5, when Runo found Dan's Baku-Pod. On the Baku-Pod was a message from Masquerade to meet him at the river at 3:00, Runo decided to go fight Masquerade, but instead of Masquerade, it was Tatsuya and he lost to her. He uses Pyrus Bakugan and is a bully to the local kids, but most of the time, instead of brawling them, he just harasses them. He talks a lot more than he fights. Tatsuya's Guardian Bakugan is a Pyrus Fear Ripper. His Pyrus Mantris and Stinglash were sent to the Doom Dimension by Masquerade's Centipoid easily.
His name is similar to a character from Beyblade Metal Fusion named Tetsuya.
So far, Tatsuya hasn't won a single battle.
Bakugan Battle Brawlers