Soh being cool.

The way Yoshiro looks at Soh is adorable. Again, no one seems to look at Soh.

Emanation.

Yoshiro is praying here.

From an article on emanation:

"According to Wikipedia, one early Buddhist text, the Samaññaphala Sutta, lists the ability to create a “mind-made body” or manomāyakāya or as one of the “fruits of the contemplative life”.'"

The armor of Soh: physical or not?

EDIT: it's called Ceremonial Preparations!! I made a mistake because I'm a fool. RIP. But the question about the armor remains...

 In Kunitsu-Gami, if Soh is a spirit given physical form by Yoshiro, who puts this armor on?

Ceremonial Procession PREPARATIONS

Looking up Procession, I saw mention of 'the emanation of the Holy Spirit' in Christianity.
(In the original Aramaic scriptures, the Holy Spirit is She and Mother, considered to be the feminine side of God as God is All.)

Ignoring theology of Christianity because this is a Japanese game, it's interesting that this followed 'The Sacrifice' scroll because it really does seem like Soh emanated from Yoshiro.

But why does the armor exist on its own when it's clearly magical in the game? Soh loses most of it when Batsu steals it. (In a trailer of the game, it's said that the Seethe are attempting to steal Yoshiro's power. Interesting that it applies to Soh since most Seethe will ignore Soh and make a beeline for Yoshiro, unless you're fighting a boss.)

The idea of the Holy Spirit exists across religions in different names.(including the term 'soul').
But if I recall it's purpose, then one could say it's Soh's role. 

Yoshiro is similar to the archetype that Jesus belongs to; sacrificing herself for the sins of others, being divine, accompanied by a spirit. Even inheriting the power of the Goddess she devoted herself to. 

Interesting pose

Yoshiro walks the path of the Goddess and 'Birth of a Goddess' is a scroll. Soh emanating from Goddess Yoshiro? Maybe. But I think they're ultimately one and combined, create the goddess. 

(Manly P Hall has a nice lecture on the soul as the immortal friend.)

“Reincarnation is what happens when someone takes rebirth after the predecessor's passing away; emanation is when manifestations take place without the source's passing away."

So...this fits...

Reading more on this idea, although very briefly,  'the emanation body', to me, sounds like the soul and it's ability to take on many forms, including that of an animal. And of course, it's ability to be helpful.

About maidens and cleansing impurity...Lily from Enders Lillies also fits here.
The Divine Maiden archetype accompanied by spirits and cleansing a type of sin/defilement/sickness. Yorda from Ico too, possibly. Able to destroy the pursuing dark spirits and becoming weaker, eventually turning into pure darkness at the end which is revealed to be her true form. She's also stronger in this form.

Wearing the mask of Soh.

Yoshiro seems to act through Soh. 

When Yoshiro dances along the Spirit Path to purify, Soh runs around purging defilement. 

They're performing one action, together. 

What Yoshiro is doing, Soh is doing. 

At night, Soh fights the Seethe while Yoshiro dances emphatically. If Soh is struck hard enough, Yoshiro is affected. (Cut-scene only)

Soh is definitely tethered to Yoshiro. 

I often felt like Yoshiro metaphorically 'wears' the mask of Soh and acts through Soh.

Parallels once again.

Normal Ending

True Ending

Flower motif...

Cursed Soh's sheer flaps that hang from her hips look like wilted flower petals(compared to Soh's healthy ones). Her long red nails are visually striking in her 3D render.

The Divine Maiden.

The Sacrifice

Why are there skulls here in this place where the Divine Maiden undergoes the 'Sacrifice' ritual? 

It almost gives the impression she dies and returns as a spirit. And she has Soh's face. 

I thought it might be to call upon ancestral spirits but the title is 'The Sacrifice'. Unless it's the acknowledgement of what happens to the Maiden when she walks the Path as she suffers and eventually becomes the Spirit Stone.

Ceremonial Processions PREPARATIONS

Kunitsukami

Then come the Ceremony Processions where everyone gets their masks. Then we see Soh fighting Seethe.

Maybe The Sacrifice is her giving up her life to eventually become the spirit stone. But it really does seem like the Maiden is split into two beings.

I think a lot is lost in translation or tied to cultural knowledge. Knowing Soh means ancestor(or Esteemed One) and that Soh does not actually have a name is pretty important lore. But the name thing was only revealed in the play.