Jack Punt, likely the youngest member of Team Anubias based on his size, sports yellow hair. He typically wears a light green vest over a white long-sleeved shirt featuring blue prints, paired with dark gray pants. His personality is characterized by an obnoxious and insane demeanor; he frequently laughs hysterically, even in serious situations, a sound resembling a hyena or jackal that annoys both teammates and opponents. His pupils become very small when excited or laughing. Jack exhibits sadistic tendencies, taking pleasure in others' suffering and taunting opponents to provoke anger and rash decisions in battle. He battles exclusively with the Aquos attribute, the only Team Anubias member to use a single attribute and not use Bolcanon. He initially wields Aquos Krakenoid as his Guardian Bakugan, later switching to Aquos Ziperator. His battle record includes several losses, primarily to Marucho Marukura. His first encounter with Marucho and Trister using Krakenoid ends without an outcome when Zenthon intervenes and defeats Krakenoid. He loses again to Marucho in "Back In Sync" despite using BakuNano enhancements. In "Mind Search," he participates in a Capture the Flag challenge with Krakenoid, attacking the Battle Brawlers in the sewers but failing due to Marucho's strategy. Jack witnesses near-deletion scenarios involving Team Anubias and Chaos Bakugan in "Interspace Under Siege" and escapes Zenthon's attack in "A Hero Returns." He experiences shock and devastation upon discovering Anubias's alliance with Mag Mel in "True Colours." Following this betrayal, he flees the damaged Interspace with his team in "Unfinished Business," reflecting on their manipulation by Anubias. In the finale, Jack transitions to a supportive role. He uses Ziperator alongside Ben and Robin to aid Noah against Chaos Bakugan in "Behind the Mask" and helps defend Dan and Drago. He joins the combined forces of Team Anubias, Team Sellon, and the Battle Brawlers to fight the Razen Titans, Dreadeon clones, and Chaos Bakugan army in "Dark Moon" and "The Final Takedown," contributing to their victories. After the conflict, he congratulates Dan alongside other brawlers. Trivia notes include his resemblance to Marche Ovis from Beywheelz and his status as the only Team Anubias member with a known last name in the English version. His development shows a shift from an antagonistic lackey to a reluctant ally in the final battles.