The Takamachi (高町) family is originally from Uminari City, Earth, but its youngest members reside in Midchilda, as of ViVid. It was first introduced in Triangle Heart 3 and, consequentially, in Magical Girl Lyrical Nanoha.
In Triangle Heart 3, the Takamachi family is revealed to have descended from the well-established samurai clan Fuwa. In fact, Shiro Takamachi's surname at birth was Fuwa, but he changed it when he married Momoko Takamachi, presumably to throw the many enemies he has made in bodyguard business off his trail.
- Shiro Takamachi (born in 0028, formal head of the family)
- Momoko Takamachi (born in 0032, Shiro's wife)
- Misato Mikami (younger sister of Shiro, only appears in the Triangle Heart and movie continuities)
Shiro's children (in order of seniority):
- Kyoya Takamachi (born out of wedlock to Shiro's paramour Kaori in 0046)
- Miyuki Takamachi (born in 0048, adopted, originally Kyoya's cousin)
- Nanoha Takamachi (born in 0056 to Momoko)
- Vivio Takamachi (officially born in 0069, adopted by Nanoha in 0075; genetically a member of the long-extinct Sägebrecht family)