Koga Nijuikke (甲賀二十一家)

Koga Nijuikke (Twenty-one Families of Koga) refers to the most trusted twenty-one families of all the fifty-three families of Koga, which received letters of commendation from the ROKKAKU clan and later played a central role in the Ninjutsu (Ninja Art) of the Koga-ryu School.

The Yamanaka Family-the family's well-known figures include Toshifusa YAMANAKA, Nagatoshi YAMANAKA, Toshiyoshi YAMANAKA, and Judayu YAMANAKA.

The Ban Family-the family's well-known figures include Naganobu BAN and Gohei BAN.

The Minobe Family
The Kurokawa Family-the family's well-known figures include Yoshiro KUROKAWA; The Kurokawa School.

The Tongu Family
The Ono Family
The Iwamuro Family
The Akutagawa Family-the family's well-known figures include Shichirobei AKUTAGAWA and Seiemon AKUTAGAWA.

The Oki Family
The Saji Family-the family's well-known figures include Saburo SAJI.

The Jinbo Family
The Okawara Family
The Ohara Family-the family's well-known figures include Kageharu SASAYAMA.

The Wada Family-the family's well-known figures include Koremasa WADA.

The Ueno Family
The Takamine Family
The Ikeda Family
The Taki Family-the family's well-known figures include Kazuuji NAKAMURA, Kanpachi TAKI, and TAKI Hida no kami.

The Ukai Family
The Naiki Family
The Hattori Family

Ninja
Jinichi KAWAKAMI-the man who handed down Banke Shinobi no Den (The Ninja Art of the Ban Family Tradition)
The Taki Clan of Koga Ninja