{{Gintama-char
|romajiname1 = Ketsuno Seimei
|kanjiname1 = 結野 晴明
|imagename = Ketsuno-seimei mug.png
|seiyuu_kanjiname = Hikaru Midorikawa
|seiyuu_romajiname = 緑川 光
|links = link
|occupation = Onmyoji
|affiliationENG = Ketsuno Family
|affiliationJAP = 結野家族
|species = Human
|gender = Male
|hair = Sandy brown
|eyes = Dark purple
|status = Live
|basic_info = Ketsuno Seimei 結野 晴明 is the current head of the Ketsuno clan. He is a genius and is considered to be the strongest onmyoji in the clan's entire history. He is also the brother of Ketsuno Crystal.
|appearance = He has short, sandy brown hair with a ponytail and dark purple eyes. He is usually seen wearing the Ketsuno clan's onmyoji uniform.
|personality = Seimei is strict and hard-working, but also cares a lot for and worries about his sister Crystal.
|story = During his childhood he was considered a prodigy, showing great talents within the onmyoji arts. He tried to befriend Shirino Douman, but due to an old clan feud their friendship didn't last long, and instead they became rivals.
|quote=
|trivia=
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