Norihiro Saenoyama, born Norihiro Hasegawa, is a professional sumo wrestler from Shibakiyama Stable. Standing 191 cm tall and weighing 149 kg, his muscular physique features light skin, long black hair tied in a traditional topknot, and black eyes. He joined Shibakiyama Stable after middle school alongside Hiroki Tsuda to pursue sumo. His combat style showcases a devastating downward open-hand punch and extraordinary leg flexibility.

Saenoyama first encountered Hinomaru Ushio during training, initially dismissing Hinomaru’s technique as sloppy and criticizing his yokozuna ambitions as disrespectful. He dominated their early sparring sessions but acknowledged Hinomaru’s potential after the latter forced his knee to the ground in a bout requiring official review. This pivotal moment shifted Saenoyama from critic to mentor, inviting Hinomaru for further training.

Years later in a championship-deciding four-way playoff, Saenoyama faced Hinomaru as stablemates, with Hinomaru emerging victorious. Saenoyama embodies Bruce Lee’s "water-like zen" philosophy in sumo, contrasting Hinomaru’s aggression. Outside the ring, he dates Chizuko Hori and pursues interests in billiards and baseball.

His birth surname Hasegawa means "long valley river," while Saenoyama blends "serene/cold/skillful" and "mountain." He has blood type A.