At first she is fusion After that Author change her origin to make her available for FGO
In fate/kohaace She is Okita that use holy grail that fill with 7 servants(include nobu that kill herself for that) to boost her power,it appear that she may connect to root because after fight end and she revert back she still can summon mini nobu on her own.
Alter Majin Saber LilyCan you say Mama and Mama's names?I told you it's a misunderstandiiiing!!!Okita Souji SantaThere's no way in hell I'll accept this!!!