Niro Androalphus is the younger brother of Ichiro Androalphus, both heirs to the Androalphus family's legacy of demonic negotiation. Trained since childhood in their bloodline magic "Trigger" or "Switch"—using provoking words to incite reckless actions—the brothers nevertheless resented this verbal ability, seeing it as diplomacy, not true combat, and dreamed of glory through physical prowess. Seeking battlefield recognition, they fled Babyls Demon School's entrance ceremony to the northern front, only to face swift defeat. Rescued from near death by General Furfur, he took them as disciples. Furfur drilled them in rigorous combat and taught them to embrace "Trigger" as a tactical weapon, channeling it into battle taunts that destabilize foes; its effect on magical beasts, inducing berserk states, is termed "Wailing." This mentorship healed their self-hatred of their innate power. Furfur also bestowed the collective name "Dorodoro Brothers." Niro's combat role focuses on analysis and strategy. He employs a specialized phone to research opponents, crafting customized verbal provocations for "Trigger," while Ichiro executes physical maneuvers based on Niro's precise commands. This synergy creates "Unparryable Unison," a flawless combat technique defined by impervious coordination between Niro's tactical guidance and Ichiro's seamless execution. Physically, Niro is of medium height with fair skin. His short blond hair tips into aqua-blue, matching two head stripes and cyan feathers featuring dark blue centers. His eyes typically stay closed but reveal yellow, triangular pupils when open. Four fangs are present, the lower pair visible with his mouth closed. He wears a light green military uniform with a gray ribbon, belt, and a left-arm "2" patch. The kanji "泥" (doro) adorns his pants, complemented by brown gloves, boots, and two golden earrings on his right ear. The brothers revere General Furfur as their savior and mentor, crediting him for their combat skill and self-acceptance. When Furfur departed to train Babyls' Abnormal Class, the Dorodoro Brothers misinterpreted his assignment, mistakenly identifying students Asmodeus Alice and Sabnock Sabro as his trainees. This led them to confront the duo during the Harvest Festival, aiming to reclaim Furfur's attention.