A girl who insists that she is an oni, even though Gensokyo supposedly doesn't have any. Suika and Yugi Hoshiguma were once part of the four devas of the mountains, long ago before the oni retreated underground. As an oni, she loves drinks, feasts, and competition. Despite her small size, she is strong in strength, speed, and mystic powers; she is also several hundred years old. Using her ability to control density, she can gather people to form a banquet, or she can scatter herself to become mist. In Immaterial and Missing Power, she made the residents of Gensokyo have feasts one night after another, intending to draw the joyous oni from hiding.