Otto Suwen originated from a middle-class merchant family in Picoutatte, Lugunica. His childhood was defined by profound emotional isolation stemming from his Divine Protection of Soul Language, also known as Divine Protection of Anima Whispering. This ability forced him to endure constant, unintelligible voices from all living creatures since birth, rendering human speech incomprehensible and emotional expression impossible until age eight. That year, he learned to distinguish human voices from the chaotic noise. A significant turning point occurred when he wrote "thank you for everything" to his parents, triggering his first emotional outburst—described as his "second birth-wail." At ten, Otto identified his ability as a Divine Protection. Public exposure by his younger brother led to ostracism; demonstrating it by summoning Zodda bugs earned him the derogatory nickname "Zodda Bug Boy." A later incident, where Otto used his ability to reveal a local official's daughter's infidelity, resulted in an assassination attempt. Forced to flee Picoutatte at sixteen, he became a traveling merchant using his father's connections. Misfortune relentlessly pursued him—bandit attacks, ruined trades, natural disasters—yet his sharp business acumen alone maintained a precarious financial balance, averting bankruptcy. A critical disaster struck when Otto was tricked into transporting oil to Gusteko. Diplomatic relations collapsed mid-transit, leaving him bankrupt. Desperate, he accepted a dubious job transporting passengers, unknowingly working for Witch Cultists who captured him. Imprisoned and separated from his earth dragon, Frufoo, Otto neared despair until Natsuki Subaru rescued him. This encounter ignited Otto’s "third birth-wail," cementing his resolve to repay Subaru’s lifesaving debt. He joined Subaru’s faction within the Emilia camp, ultimately rising to Minister of Internal Affairs. Otto’s capabilities center on his Divine Protection, enabling communication with all living beings by speaking their languages, though overuse causes nosebleeds. He manipulates earth, water, wind, and sound magic, muffling footsteps or eliminating scents for stealth. With embedded magic stones, his combat potential escalates significantly, evidenced by harming opponents like Garfiel Tinsel. He possesses extrasensory perception, martial arts training, and superhuman stamina, demonstrated by enduring a three-day dragon carriage ride. His ground dragon, Frufoo, shares a lifelong bond; her Divine Protection of Wind Evasion negates wind resistance during travel. Otto’s development emphasizes debt and loyalty. He views aiding Subaru and the Emilia camp as repayment for his life, declaring "Because he’s my friend!" during crises. His merchant ethos—"debts must be repaid"—fuels strategic actions like delaying enemies in pivotal battles. Despite residual trauma from his Divine Protection’s overwhelming chorus, he harnesses it unreservedly for his allies.