An old kele koro family based on the Kusanagi Peninsula in Shirojima, Kaigen. Historically, the Matsuda family has produced the best swordsmen in Kaigen. They are known for the Sasayaiba (or ‘Whispering Blade’), a technique passed from father to son among the most powerful fighters in the clan wherein the fighter produces ice sharper than steel in the shape of his weapon of choice.

The Matsuda family has close ties with the Yukino, Mizumaki, and Kotetsu families.

Notable historical figures and people in the Theonite Series:

  • Ayumi (5369, jijaka, Kaigenese, female) a student at Daybreak Academy, daughter of Takashi and Setsuko (first appearance: Orbit)
  • Hiroshi (5365, jijaka, Kaigenese, male) a student at Daybreak Academy, the youngest known master of the Whispering Blade, son of Takeru and Misaki, younger brother of Mamoru, older brother of Nagasa and Izumo (first mention: Planet Adyn, first appearance: Orbit)
  • Izumo (5369, jijaka, Kaigenese, male) a student at Daybreak Academy, son of Takeru and Misaki, younger brother of Mamoru, Hiroshi, and Nagasa, childhood friend of Daniel Thundyil (first mention: Planet Adyn, first appearance: Orbit)
  • Mamoru (5355, jijaka, Kaigenese, male) a student at Kumono Academy, son of Takeru and Misaki, older brother of Hiroshi, Nagasa, and Izumo, student of Yukino Dai and Kotetsu Katashi, friends with Kwang Chul-hee, Yukino Yuuta, and Mizumaki Keichi (first mention: Orbit, first appearance: The Sword of Kaigen)
  • Misaki (maiden name: Tsusano, alias: Shadow) (5335, jijaka, Kaigenese, female) a former student at Daybreak Academy, wife of Takeru, mother of Mamoru, Hiroshi, Nagasa, and Izumo, close friends with Robin Thundyil, Koli Kuruma, Elleen Elden, Guang Ya-li, Yukino Hyori, and her sister-in-law, Matsuda Setsuko (first mention: Planet Adyn, first appearance: The Sword of Kaigen)
  • Mizudori (5258 – 5351, jijaka, Kaigenese, male) the first Matsuda headmaster of Kumono Academy, master of the Whispering Blade, father of Susumu, grandfather and mentor to Takashi and Takeru (first mention: The Sword of Kaigen)
  • Nagasa (5367, jijaka, Kaigenese, male) a student at Daybreak Academy, son of Takeru and Misaki, younger brother of Mamoru and Hiroshi, older brother of Izumo (first appearance: Orbit)
  • Setsuko (maiden name: Chiba) (5337, jijaka, Kaigenese, female) wife of Takashi, mother of Ayumi, close friends with Yukino Hyori and her sister-in-law, Matsuda Misaki (first appearance: The Sword of Kaigen)
  • Susumu (5297 – 5363, jijaka, Kaigenese, male) the second headmaster of Kumono Academy, son of Mizudori, father of Takashi and Takeru, grandfather of Mamoru, Hiroshi, Nagasa, Ayumi, and Izumo (first appearance: The Sword of Kaigen)
  • Takashi (5327, jijaka, Kaigenese, male) the third Matsuda headmaster of Kumono Academy, master of the Whispering Blade, son of Susumu, older brother of Takeru, husband of Setsuko, father of Ayumi (first appearance: The Sword of Kaigen)
  • Takeru (5329, jijaka, Kaigenese, male) master of the Whispering Blade, son of Susumu, younger brother of Takashi, husband of Misaki, father of Mamoru, Hiroshi, Nagasa, and Izumo (first appearance: The Sword of Kaigen)
  • Takeru I the first master of the Whispering Blade (first mention: The Sword of Kaigen)