Suomi Kyoko: the Time Stranger, and the princess of the Earth Kingdom. Since she dreads her peers to know that she's the princess, she undergoes a quest to awaken her twin sister Ui so that she may become crown princess in her stead. She gradually falls in lovewith Sakataki.
Jin Sakataki: Kyoko's bodyguard from the now destroyed Dragon Clan. He turns out to be the Crystal Stranger later in the series. He gradually falls in love with Kyoko.
Jin Hizuki: Kyoko's bodyguard from the now destroyed Dragon Clan. He turns out to be the Ice Stranger later in the series.
Momoto Karen: Kyoko's friend and class mate as well as the head of the Flower Clan. She turns out to be the Flower Stranger later in the series
Earth King: Kyoko's and Ui's father
Chocola: the Earth King's pet, a human-cat hybrid
Suomi Ui: Kyoko's twin sister who has been in a comatose state since her birth.
Time Scorpion Cane: nicknamed "Staffy" by Kyoko much to its frustration, it's the sentient staff inhabitating the time stone.
Onishi Akira aka Widoshiiku: head of "The Smashers" Gang from the Snake Clan, who's also a fashion designer / boutique owner. After his first failed abduction attempt, he vows to make Kyoko his one day.
Onishi Sarai: Head of the Snake Clan, and Widoshiiku's younger brother. He turns out to be the Thunder Stranger later in the series. He's in love with Mizuno.
Mizuno: Head of the Fish Clan. She turns out to be the Aqua Stranger later in the series. Eventually, she seems to give in to Sarai's advances.
Ginga: Mizuno's brother and former head of the Fish Clan; he chose to leave his clan behind and to join Widoshiiku's gang, to whom he became very close.
Lartuone: A Mazuko who's determined to destroy the Fish Clan, and later reveals that she travelled to this point in time from the future.