Adorable!~
Wish I knew more about the Touhou world. Seems like new characters keep popping up that I've never heard of.
Those two are awesome.
Is it Kanako & Suwako that you don't know about, or Koishi, the so-called subconscious of Gensokyo?
Basically everyone besides Reimu, Marisa, and Meiling.
lol
Suwako and Kanako are gods from outside who came to Gensokyo with their wind priestess, Sanae, who is actually a descendant of Suwako but doesn't know it. Suwako is an ancient land god associated with water, frogs and iron rings. Kanako is a sort of a regional god who came later, to fight Suwako and win her territory and eventually they worked out a kind of coexistence. In a way, they're now-friendly adversaries who are bound together, much like Kaguya and Mokou.
Koishi is the sister of Satori, and the two sisters had the ability to read minds with their third eye. They retreated to the underground/old hell, along with the oni, because they were hated/driven out of the surface long ago. Koishi sealed her third eye and gained power over the subconscious, often becoming invisible as people wouldn't be able to notice her presence. She largely lives directed by her own instinct.
That pretty much covers the basics, I think.