Leysritt is a Homunculus created by the Einzbern family, an Ether Clump given an imperfect soul through an unknown process only known by the head of the Einzbern and different from the process used for homunculi like Sella.She was amongst failures in the creation of the Holy Grail and was originally meant to be scrapped, but she was given a new life as Illya's maid and bodyguard.
Sella is a Homunculus created by the Einzbern family, the product of a hundred different kinds of alchemy.She was amongst failures in the creation of the Holy Grail and originally she was meant to be scrapped, but she was given a new life as Illya's maid and teacher.