Kōichi Tachibana (橘 浩一 Tachibana Kōichi) is the husband of Yumiko Tachibana and the father of Aiko Tachibana and Ryota Tachibana.
Etymology 
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| Characters of A.I.C.O. -Incarnation- | |
| Main | Aiko Tachibana · Yuya Kanzaki |
|---|---|
| Divers | Daisuke Shinoyama · Maho Shiraishi · Yoshihiko Sagami · Kazuki Minase · Haruka Seri · Kaede Misawa |
| Supporting | Gummi · Hori · Kyōsuke Isazu · Yuzuha Isazu · Kiryu · Susumu Kurose · Akiko Nanbara · Nanami Ozanami · Saho · Original Aiko · Kōichi Tachibana · Royta Tachibana · Yumiko Tachibana · Toshihe Yura |
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