Ace Grit, a 16-year-old Vestal, serves as the Darkus brawler in the Bakugan Battle Brawlers Resistance. His primary partner, the Darkus Bakugan Percival, evolves into Knight Percival, while his Trap Bakugan, Falcon Fly, becomes Flash Falcon Fly. After losing to Mira Fermin, she gifted him Percival to prove Bakugan’s sentience, shifting his view of them from tools to allies. Cocky and hot-headed, Ace’s impulsiveness often sparks conflicts or reckless choices. Initially distrusting humans like Dan Kuso and Marucho Marukura, a battle stalemate with Dan eased tensions, though friction lingered. His rivalry with Aquos Vexos member Mylene Farrow featured two clashes with one win each, ending abruptly when she perished during Bakugan Interspace’s collapse after her defeat by Mira and Keith Fermin. Protective of Mira due to unspoken romantic feelings, his jealousy toward Dan and her brother Keith strains their interactions. Despite early clashes with Shun Kazami over strategy and communication, their mutual respect grows. Ace’s solitary nature fuels independence, yet he remains fiercely loyal to allies. During the Resistance’s campaign against Vestal control, Ace stalled Vexos agents in the Alpha City tournament and aided Dan against Gus Grav and Mira. Blinded by loyalty, he fell into a Vexos trap after mistaking Shadow Prove’s mimicry for Mira’s voice. When Mira briefly defected, Ace wrestled with betrayal but trusted her true motives, later vindicated when she rejoined. Post-liberation of New Vestroia, Ace returned to Vestal with Mira and Baron Leltoy to thwart Vexos resurgence. Granted Darkus Attribute Energy by Exedra, he evolved Percival into Knight Percival. He battled Mylene’s mechanized Aquos Macubass with Klaus von Hertzon’s aid and clashed with Shadow Prove and Lync during the Vexos Motherpalace assault, losing the Darkus Energy. After the BT System’s destruction, Ace remained on Earth, encountering phantom data in Bakugan Interspace. He later appeared in a *Mechtanium Surge* flashback cameo and a *Battle League* live event, helping Marucho escape but losing to Shun in qualifiers. Ace’s journey saw him temper brashness with strategy, deepen trust in allies, and navigate emotional complexities. Evolving from a skeptical recruit to a Resistance cornerstone, he balanced flaws with unwavering dedication to Bakugan freedom.