TV-Series
Description
Hinomaru Ushio, competing under the shikona Onimaru Kunitsuna, overcame significant physical hurdles to pursue sumo's yokozuna rank. Standing initially at 152 centimeters and later 157 centimeters, far below the professional minimum of 167 centimeters, his muscular build grew from 79 to 93 kilograms post-time-skip. Exceptional strength and technique compensated for his size. His appearance featured long reddish-black hair resembling fire, amber eyes, and multiple training scars, including one on his lower left cheek. Post-time-skip, he adopted traditional sumo attire and a topknot.

Winning consecutive elementary school yokozuna titles earned him the epithet "National Treasure Onimaru Kunitsuna." He left competitive sumo in junior high after three consecutive losses worsened by height limitations and pressure to change his fighting style, training intensely in isolation. Entering Oodachi High School, he revived its nearly defunct sumo club as vice-captain, leading it to win the Inter-High Tournament national championship against rivals like Tennōji Shidō and Kuze Sōsuke. This victory secured him a sandanme tsukedashi exemption from the professional height requirement, enabling him to join Shibakiyama Stable and adopt his epithet as his ring name.

Ushio displays a friendly, easy-going nature outside the ring but transforms into a fiercely focused, explosive fighter within the dohyo, drawing energy from the crowd. Deep-seated insecurities from his mother's death fuel anger towards abandonment or jokes about mortality. He expresses discomfort with romantic attention, calling himself a "sumo freak" incapable of emotional reciprocity, complicating his relationship with Reina Gojo (later his wife). His defining flaw is an extreme results-oriented mindset leading to reckless self-neglect during matches – a "death wish," termed by peers, involving disregarding injuries to win. Excessive self-reliance makes accepting help from others difficult, and his immersion in sumo fostered old-fashioned habits like avoiding mobile phones.

His "yokozuna-style" sumo emphasizes head-on clashes, leveraging his low center of gravity. Specializing in throws, his signature technique is the right underarm throw "Demon Wheel" (鬼車). He integrated strikes learned from karate practitioner Yūma Gojō and evasive maneuvers inspired by Kei Mitsuhashi. Evolving from brute force, he incorporated scouting and varied techniques after analytical losses. His stature left him vulnerable to endurance-based opponents and counter-strikers with superior reach, while chronic left-arm injuries forced adaptations like finishing bouts quickly with his right-handed Demon Wheel.

Professional sumo brought greater challenges, including a severe right-arm injury causing a two-year absence. His return coincided with yokozuna Jin'o's dominance, motivating Japanese wrestlers to unite in a training camp. During the September Tournament, losses to Jin’o prompted former high school teammates to help strategize. After defeating ōzeki Kinkaizan, he publicly proposed to Reina, symbolizing his growth. He finished the tournament undefeated, culminating in a playoff victory over Jin'o. In the epilogue, set six months later, he is an active top-division wrestler (west maegashira 3) married to Reina, balancing career and personal commitments.