Koshi is a guest character who first appears in The Kelp Monster Mystery in Season 4. She then becomes an Octo-Agent in Octonauts: Above & Beyond. Koshi is Dashi's younger sister who is a natural, expert detective, as seen in The Kelp Monster Mystery. She is a fan of mystery novels, especially Donna Doxi, and is honest and well behaved around others. Dashi gave Koshi her collection of mystery books she read when she was little, and Koshi has read 54 out of 100 of them (55 out of 100 after she fi
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