Mira Fermin, a Vestal teenager, co-founded the Bakugan Battle Brawlers Resistance alongside Baron Leltoy and Ace Grit. Her resolve solidified after witnessing the tortured Alpha Hydranoid speak, revealing Bakugan as sentient beings, and she became their leader fighting to liberate Bakugan from Prince Hydron's Vexos forces on New Vestroia. Her primary partner is the Subterra-type Magma Wilda, supported by the Trap Bakugan Baliton. Physically, Mira possesses short orange hair, blue eyes, and a youthful look at age sixteen during the New Vestroia conflict. Her typical attire includes a silver jacket, blue earrings, a rouge jumpsuit, and uneven boots. She sometimes wears a yellow motorcycle helmet and carries a locket with a picture of her missing brother. Later, during Mechtanium Surge, her outfit changes to a white track jacket with blue stripes over a blue dress and a black collar, while her hairstyle remains consistent. Mira's personality blends stubbornness and tomboyishness, often likened to Runo Misaki. She adapts readily, acting girlishly to distract Vexos guards or using flirtation to bypass security at her father's lab. As Resistance leader, she motivates the team, bolsters Baron's confidence, and mediates disputes. Her driving force is finding her missing brother, Keith Fermin, leading her to undertake perilous solo missions and clash repeatedly with Ace over priorities, which occasionally undermines her acceptance as leader. Her family shapes her story profoundly. She is the daughter of Vexos scientist Clay Fermin and younger sister of Keith Fermin, who reappears as the masked Vexos member Spectra Phantom. Discovering Spectra's true identity during an Earth confrontation, Mira betrays the Resistance to join the Vexos, hoping to reconnect with Keith. This choice forces her into battle against her brother; defeat binds her to serve him under Vexos command. Later, facing Dan and Ace, she deliberately loses to secure the Resistance's victory and recaptures stolen Bakugan, rejoining her allies afterward. Key developments are driven by these relationships. She collaborates with Keith to rescue their father from the collapsing Alternative weapon system, though Clay perishes saving her during the escape. After Keith defects from the Vexos and rejoins the Resistance unmasked, they reconcile. Mira later aids Keith in battling Mylene Farrow and Shadow Prove within Bakugan Interspace, narrowly escaping its collapse. In Mechtanium Surge, Mira serves as technical support. She develops new Battle Suits for the Brawlers, collapsing from exhaustion during their creation. After recovering, she provides strategic analysis against threats like Wiseman and the Nonets, utilizing data on opponents such as Dragonoid Destroyer's energy reserves. She pilots a helicopter to Volcano Island during the final clash against Mechtavius Destroyer. A timeline reversal prevents her death when the creature destroys Bakugan City. Her Bakugan partner shifts to Roxtor during this period, and she assists in combining Bakugan forms, like Roxtor with Radizen.