If you're checking the Wikipedia article, the directly relevant part here is Ròuzhī. The rest are different variants.
And as for the mushroom Reimu brought up, I suppose it looks like beef jerky?
But to my current understanding, the concept for Tojiko is that she used to be vengeful. But at this point, her grudge has mostly dissipated, and she's practically a regular lightning ghost now.
Meaning being vengeful is a spectrum for a ghost to land on.
I... just realized. While Flandre being a dog may seem out of the blue for us English speakers, we must take note that Flandre is pronounced "Foo + Run + Door + Ru"
"Flandog" changes just one sound, becoming "Foo + Run + Door + Gu"
I think this is the third time now with Flandre being the deus ex machina?
The Hakurei Grail – Flandre destroyed the grail.
Babel – Flandre crippled Yatagarasu.
Alternative Eater – Flandre destroyed these giants.
Ah... the lineage of Yamata no Orochi. Wait a fucking minute.
There's an alternate telling that Orochi wasn't killed by Susano'o, but actually fled to Mt. Ibuki. Yes, that Ibuki. That Shuten-dōji was a child of Orochi.
This snake god here is Suika's nephew/niece ❤️