Sellon, an artificial Neathian forged by Mag Mel, emerges as a central antagonist commanding Team Sellon while holding the rank of Bakugan Interspace’s third-most-powerful brawler, surpassed only by Dan Kuso and Anubias. Her striking appearance blends long dark blue-black hair, pale pink skin, and piercing dark green eyes. When transformed into her Neathian state, her design shifts to spiked, Gundalian-inspired armor with darker hues and a shirt emblazoned with Razenoid’s signature eye motifs. A master of calculated elegance and concealed savagery, Sellon cloaks her ruthless tactics in a veneer of honor. She demands stylistic precision in battle yet coldly exploits opponents’ vulnerabilities, notably tormenting Shun Kazami by amplifying his self-doubt. Her manipulations extend to Anubias, whom she prods to prioritize Mag Mel’s mission over personal vendettas. Though she disdains dishonorable methods like the Tri-Twisters’ schemes, her own strategies involve calculated deception, such as deliberately losing the championship semi-finals to Marucho Marukura to advance hidden agendas. Tasked with reviving Mag Mel and seizing Drago and Dan’s "Gate" and "Key," Sellon orchestrates psychological warfare against the Battle Brawlers, including engineering Shun’s temporary leadership to fracture team cohesion. Her arsenal includes guardian Bakugan Ventus Spyron, shared Subterra Vertexx with Chris, and Haos Krowll with Soon, alongside Chaos Bakugan like Iron Dragonoid and Flash Ingram—tools granted by Mag Mel but later destroyed. Pivotal clashes define her arc: allying with Anubias to combat Zenthon, failing to defeat Dan and Shun in a tag battle, and enduring betrayal when Mag Mel drains her energy after she fabricates an illness to steal Dan’s Key. Her demise concludes with a spectral farewell, urging teammates Chris and Soon to resist the Razen Titans. Artificially engineered, Sellon wields rare multi-attribute mastery (Subterra, Aquos, Darkus, Ventus) and superior Mechtogan control, evading the physical toll plaguing Anubias. Their rivalry, echoing past series dynamics, fuels a relentless contest for Mag Mel’s approval, underscoring her blend of lethal ambition and warped loyalty.