Kyon's sister

General

Like Kyon, Kyon's sister is a normal human with no supernatural abilities at all. Apparently, Kyon's sister was responsible for spreading Kyon's name around, as when the siblings' aunt came to visit, she referred to Kyon with the pet name "Kyon", and his sister told it to her friends. Kyon apparently does not like this, as he misses the time she once called him "older brother" (お兄ちゃん, Onii-chan). (Not referring to an older brother in a way resembling this in Japan is unusual. Kyon's sister even goes as far as to refer to him as "Kyon-kun", using the subordinate "-kun" suffix; in normal life, this would be considered very rude, and so it can be assumed that Kyon is somewhat tolerant of this.) The voice actress for Kyon's sister, Sayaka Aoki, once said that using a nickname like Kyon shows both that she is close to her brother and that she does not idolize him.

Background

Kyon's sister plays a very minor role in the series, once in a while participating in SOS Brigade activities such as helping out in the baseball game in "The Boredom of Haruhi Suzumiya", attending the "Remote Island Syndrome" mystery (in the anime only), taking a small role in "The Adventures of Mikuru Asahina Episode 00" as Itsuki's sister, and traveling with the brigade to Tsuruya's place in "Snow Mountain Syndrome". In the Endless Eight arc, she begins the time loop by watching a baseball game with Kyon and informs him that his phone is ringing. Kyon's sister often likes to participate in SOS Brigade activities, and although Kyon likes to see her happy about all of the events, he does not want her to get too involved, especially after he meets Kyoko Tachibana and Fujiwara, thinking that they are so nasty that they might ruin her perception of espers and time travelers.