| UNDER CONSTRUCTION |
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|Also Known As||Traveler (by Koharu)|
|Relatives||Kakeru Yuiga (son)
Haruka Yuiga (wife)
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.