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Kumiko also appears in River City Girls in Pop's Sauna at Ocean Heights.
- Miyuki, another Taiyō Academy student that debuted in Nekketsu Kōha Kunio-kun Special is meant to be an equivalent of Kumiko by replacing her as a fleshed-out character. However, both Miyuki and Kumiko appear together in River City Super Sports Challenge: ~All Stars Special~ and River City Melee: Battle Royal Special.
- A character resembling Kayo appears in Nekketsu Kōha Kunio-kun Special, named Momoko. This character also acts as the cheerleader and manager of Misuzu's team in River City Super Sports Challenge: ~All Stars Special~ and River City Melee: Battle Royal Special.
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