Talk:Sitonai/@comment-4802891-20181124022226/@comment-4802891-20200110173941

@BubbleBuzz: Sorry for the late answer

Sitonai is a melting pot of deities. That makes her a High Servant, no an Alter Ego. Let's look at the other examples we have:

The Tamamo Nine can be considered Alter Egos of the original Tamamo no Mae, they were born from her tails. The Sakura Five are Alter Egos of the original A.I. called BB, they were assembled by her. Kiara is the Alter Ego of her original self as Beast III/R, she sprung an avatar to be summonable. Majin Saber is the Alter Ego of the original Okita Souji, she... I don't know, makes a special copy of her working for the Counter Force? Ashiya Douman I suspect is an Alter Ego of Abe no Seimei himself, born from the conglomerate egos of evil spirits he sealed, out for revenge but at this point this is just speculation.

What they all have in common is that they are an aspect, a copy, another version of the original article. They aren't what-ifs like Jalter, parallel versions like Demiya or corrupted heroes like Salter, they are part of the original getting an ego for themselves, thus existing separately from the source material.

As such, the only thing Illya-Sitonai could be the Alter Ego of, is the Grail. Or Justeaze, with a big stretch. But since nothing is mentioned, it is again just some speculation trying to make sense of a plothole.