||城 治 Jō
Osamu Jō (城 治 Jō Osamu?, nicknamed Joe (ジョウ Jō?)) in Japan, is also known as Webmaster Joe (ウェブマスター・ジョウ Uebumasutā Jō?). In the first season, it was revealed that due to an unknown health condition, he basically lived in a hospital for some time. During this time, the Brawlers thought that he was working for Masquerade. After Dan confronted him, he told Dan that he would only tell him the truth if Dan could beat him in a battle. In the middle of the battle, Joe fainted, and when he awoke he revealed that the brawlers' theory was untrue and he actually sent a message to all of the Bakugan players around the world to warn them that Masquerade was plotting against them. After the truth was revealed, they asked him if he wanted to become a Battle Brawler, which he gladly accepted. He then revealed that he and his mother were going on a road trip for the time being, to see the world outside of the hospital. Sometime later, after he moved to the Brawlers' neighborhood, he found Wavern, who had the Infinity Core hidden inside of her. It was also revealed that Wavern was Naga's twin sister and that he was looking for her in order to absorb the infinity core. Joe was the first person to beat Masquerade at Bakugan, after he obtained Wavern. In the end of the first series, Joe is seen with Chan-Lee, sitting on a bench.