As the series goes on, Haruhi recruits three additional members into her club: the silent bibliophile Yuki Nagato, the shy and timid Mikuru Asahina, and the friendly "mysterious exchange student" Itsuki Koizumi. These members are, in time, revealed to be the extraordinary characters she is seeking (Yuki, an artificial human created by the extraterrestrial Integrated Data Entity; Mikuru, a time traveler; and Itsuki, an esper), sent by their various organizations to observe Haruhi. All see Haruhi as possessing a superhuman control over the universe, capable even of recreating the entire universe in a state of dissatisfaction and attempt to prevent this by keeping her entertained, holding her powers in check, and maintaining the illusion of a normal life.
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