Sasa

沙砂

Sasa is an ippon-datara, a monopedal, cyclops-like demon that inhabits mountains. He serves as Ageha's accomplice and attacked Shizuku, Kaya, and Rinko at Yuto's grandparents' house. He was nearly killed by Shizuku but was spared after she witnessed Yuto's Light Ferry ability.
During his second appearance, Sasa assumes a bipedal form with androgynous features. After Rinko took him to Café Relish for ice cream, he stopped the fight between Ageha and Himari at her request. Sasa can summon giant pillars from the sky to crush opponents, increase his mass at will, and fire energy beams from his eye. Ageha mentions in the anime that his kind are excellent sword-smiths, capable of repairing and restoring broken swords to their original condition and strength.
In the anime incarnation, Sasa is portrayed as bipedal and his gender is changed to female, as the reference to him being a boy is omitted. Like Ageha, he/she becomes a supporting character following the appearance of Shuten-dōji and Tama. He/she plays a key role in restoring Himari's Yasutsuna by shooting it with his/her eye, a feat originally performed by Kuesu in the manga through some sort of time magic.