Talk:Sitonai/@comment-4802891-20181124022226/@comment-36830625-20181126154010

Alter Egos are usually combinations or parts that make up a whole. Sitonai is just represented here as she is the “most strongly present” which can either mean that she was originally the strongest among the combination of goddesses or just that she was just summoned more thoroughly for some reason. Alter Ego is actually a much more diverse category than it’s shown here, Tamamo Cat technically qualifies as an alter ego along with the rest of the Tamamo Nine. As for why Illya’s body is used, the answer is probably loli fan service or just because she’s more qualified due to being a lesser grail which might let her handle the fusion better than a normal person. It does state her excessive magic circuits makes a difference so that could also be why it’s Illya that’s the body of Sitonai.