Fenneca is a fennec fox-like Bakugan hailing from Junk Island. She emerged during the Awesome Brawlers' unstable gateway journey to Vestroia, battling fellow Bakugan over prized Earth items. Seizing the opportunity, Fenneca pursued the group back to Earth through the same gateway.

Her personality manifests as selfish and moody, marked by a dismissive attitude towards assistance and a staunch belief in solo victory. This clashed fiercely with her new human partner, Lia Venegas, a stark contrast to Lia's previous Bakugan. Fenneca often adopted the petulant demeanor of a teenager, testing Lia's patience and resisting guidance in battle, compelling Lia into an initial parental role.

This stubbornness proved costly against Duran. Fenneca ignored Lia's strategic input, blaming her for distractions mid-fight. Her refusal to cooperate directly caused their defeat. While defeated Bakugan vanished during this phenomenon, Fenneca remained—a mystery Benton pursued. Despite the loss, she persisted in rejecting Lia's partnership, further straining their bond.

Through these repeated challenges, Fenneca gradually learned the value of teamwork. She came to accept that partnering with Lia could secure victory, though she retained her inherently saucy attitude. This development was hard-earned.

Beyond the battlefield, Fenneca assumed guardianship of both the Haora Artifact and the Haos Crystal, signifying a significant role within the Bakugan world.