Joe Osamu

Personal information:
Age: 12
Gender: Male
Race: Human
Status: Alive
Faction: Battle Brawlers

Bakugan:
Main Attribute: Haos
Guardian Bakugan: Wavern (Deceased)

Joe Osamu is the webmaster of the Battle Brawlers Bakugan website. He uses Wavern and Haos Bakugan. He is hospitalized due to low blood sugar, but he gets out of the hospital quickly after he first appears.

Season 1:
Joe Osamu originally set up the website related to the Bakugan falling from the sky. Dan Kuso and Shun Kazami were among the first people to sign up in the site. He was suspected by Dan and his friends to be a spy working for Masquarade as he was webmaster and could tell Masquarade all about their activities, Chan Lee told them that Joe was in the hospital and they went there. He found Drago, who was accidentally dropped by Dan, and while Dan was trying to get info, Joe was just engaging in idle chit chat.

Joe requested that they should do a bakugan battle for the information, during the brawl, it quickly become apparent he had never been in a brawl before, becoming very excited and interested; but before they could finish their battle, Joe suddenly collapsed, Wavern, a Bakugan who held the Infinity Core called to him and used Positive Energy to wake him up.

After that, Wavern became the Guardian Bakugan of Joe. Additionally, the group was convinced that Joe wasn't a spy of Masquerade, since he posted a message on his website involving him telling any brawlers to not fight Masquerade if they run into him. Joe then became an official member of the Bakugan Battle Brawlers.

While the Bralwers are in the doom dimension he fought Masquerade with Wavern and nearly loses but later won, becoming the first person to beat him one on one. After Dual Hydranoid evolves into Alpha Hydranoid Masquerade challenges Joe again for the Infinity Core, but Dan shows up and battles him instead.Later when Wavern died he was shown to have thought of her as a friend. At the end he is shown in the background with Chan Lee confirming that they are indeed in love.

Season 2:
In Duel in the Dunes, Joe briefly appears in the group picture taken back in Season 1 shown by Dan, but he's never mentioned again in later seasons.

(Source: Bakugan Wiki, edited)