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{{Character Infobox|color = #2b2b33|Name = Shirō Yuiga|image =
|kanji name = 結賀 史狼|romaji name = Yuiga Shirō|gender = Male|status = Alive|relatives = Kakeru Yuiga (brother)
Haruka Yuiga (mother)
koharu(sister)
Shirō Yuiga (結賀 史狼 Yuiga Shirō) is Kakeru's father and the person who gave Koharu her name. He is a weapon dealer and one of the antagonists of the series. He is the person who gave Koharu her Ability User's uniform.