The "Yagami family" (八神家 Yagami ke) is a moniker given collectively to Hayate Yagami, her Guardian Knights, Reinforce Zwei, and Agito. While not actually related by blood, they are referred as a family to explain their relationship, since the truth about the Book of Darkness incident of 0065 was strictly classified by the TSAB. Hayate considers them more like family than servants and often refers to them as her "children".
- Hayate Yagami (born in 0056, parents unknown and deceased, formal family head)
- Shamal (officially born in 0043, exact origins unknown)
- Signum (officially born in 0046, exact origins unknown)
- Zafira (exact origins unknown)
- Vita (officially born in 0057, exact origins unknown)
- Reinforce Zwei (created in 0067)
- Agito (exact origins unknown, taken into the family after becoming Signum's Unison Device in 0075)