Kyon-kun/Kyon-chanThe protagonist of the story similar to the original novels. Accidentially turned into a girl by Haruhi on a whim. Not the Kyon we know from the novels.
KyonA suddenly appearing male Kyon. He is the original Kyon we know.
KyonkoThe genderflipped version from other fan projects. She and Kyon-chan are not the same person.