Well, with homophones set aside.

I was going for that whole Sakuya is a lunarian thing. Hence that is Sakuya with the bunny, along with Kaguya and Eirin playing some Lunarian battledore-and-shuttlecock.

I doubt Sakuya is as human as they claim her to be

Aside from Eirin being surprised upon seeing Sakuya

There is also this story about Konohana no Sakuyahime being related to Mokou and the Hourai elixir

The said Sakuyahime also have an older sister who is a goddess of immortality named Iwanagahime

Mind you that Lunarian names are hard to pronounce that they have to use something that humans can understand, "Eirin Yagokoro" for example :}