Mira Fermin operates as a pivotal supporting figure throughout Bakugan: Mechtanium Surge, shifting from prior leadership duties into technological and strategic assistance. Hailing from Vestal, her witnessing of Alpha Hydranoid’s torture unveiled Bakugan’s sentience, driving her to co-found the Bakugan Battle Brawlers Resistance alongside Baron Leltoy and Ace Grit during the New Vestroia conflict to free captured Bakugan from the Vexos. Her principal guardian Bakugan was Subterra Magma Wilda from New Vestroia, though she later allied with Subterra Roxtor in Mechtanium Surge. Her decisions are heavily shaped by family ties. As daughter of deceased Vexos scientist Clay Fermin and younger sister to Keith Fermin—formerly Vexos leader Spectra Phantom—she reconciled with Keith after their father perished during King Zenoheld’s defeat, mending their sibling bond. This renewal enabled her to channel energy into scientific pursuits. In Mechtanium Surge, Mira moved to Bakugan City, embedding herself in the Battle Brawlers’ base. She immersed herself in crafting advanced Bakugan technology, specifically designing specialized Battle Suits for the team’s Bakugan. Her relentless work ethic culminated in physical collapse from exhaustion during suit development. Hospitalized, she managed logistics by enlisting Runo Misaki to supervise suit deployment. Her technical acumen proved vital in threat analysis, scrutinizing the Nonet Bakugan and Mechtogan Mechtavius Destroyer by tracking energy reserves and combat metrics. Mira maintained observational and tactical oversight during missions. She monitored Marucho Marukura and Radizen’s movements to a power plant, observing Roxtor fuse spontaneously with Radizen to overcome foes. Without directing the fusion, she subsequently entrusted Roxtor to Marucho. She delivered crucial intelligence mid-battle, pinpointing Defendrix’s EM pulse as a viable counter against the Chaos Army. Her analytical precision further surfaced during the Dragonoid Destroyer’s recovery, computing its energy conservation amid critical clashes. Her engagement stretched beyond the lab. She spectated at Battle Brawlers tournament matches, vocally backing Dan Kuso. When Dan, Shun, and Marucho journeyed to Volcano Island, she and Runo stayed at headquarters for potential remote Battle Suit deployment. Later, she collaborated with Julie Makimoto to find the missing team via Kato’s helicopter, an endeavor disrupted by Mechtavius Destroyer’s assault on Bakugan City. These occurrences were ultimately voided by timeline alterations.