A major character in [i][[Mahou Shoujo Lyrical Nanoha A's]][/i] and later. A friend [[Takamachi Nanoha]] and [[Fate Testarossa]], she is effectively the third main character. Her seiyuu is [[Ueda Kana]].

Her devices are [[Schwertkreuz]] and the [[Tome of the Night Sky]].
In [[mahou_shoujo_lyrical_nanoha_reflection|Reflection]], her devices are replaced by [[Rod_(nanoha)|]], and [[Grimoire_(nanoha)|]] in [[mahou_shoujo_lyrical_nanoha_detonation|Detonation]].
八神はやて