User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-31726296-20170716021510/@comment-31726296-20170718143521

No it is not Nanoha Takamachi or any person from that verse.

I can say that her original gender was not female but male. the reason why he needed a new body was because he was about to die. However, due to someone interfering he was able to survive but in a different body.

hope this help.