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A cute, irrepressible fifth grader.
OriginLittle is known about Kyon's fifth-grade sister beyond the fact that she is the one who popularized Kyon's nickname after hearing their aunt refer to him as such. Thanks to her usage of the nickname it stuck among Kyon's friends.
PersonalityAlthough she doesn't speak much, Kyon's sister-- who remains unnamed --doesn't speak very often. She occasionally joins the SOS Brigade's adventures, whether planned (such as when she was a part of the club's baseball team) or unplanned (when she stowed away in Kyon's suitcase while the club went on a vacation).