The Melancholy of Haruhi Suzumiya follows the high school life of Haruhi Suzumiya, a young and very active high school girl, and those who are caught up in her unusual antics.
As the story progresses Kyon and Haruhi meet many new people including the time traveler Mikuru Asahina, the alien Yuki Nagato, and the esper Itsuki Koizumi, all of whom attend North High. Mikuru, Yuki, and Itsuki were all sent to monitor and observe Haruhi since she has the unconscious ability to destroy the universe and make a new one. Their mission is to keep her from getting bored, since Haruhi will create a new universe from scratch if the old one fails to remain interesting. However, they must hide Haruhi's powers from her for unexplained reasons. These three join Haruhi and Kyon to form a school club called the SOS Brigade. The entire series consists of the SOS Brigade's attempts to keep Haruhi entertained while hiding and dealing with supernatural phenomena.
Below are the characters found available on the site that cosplayers have depicted.