Character request: I can't identify the one on the far right. Can't clearly read the name, and she doesn't seem to show up on the artist's website.

Looks like "Tricholoma matsutake".

It's a couple years late, but I've written a wiki page for every mushroom girl here mainly for the purpose of listing the characters' names (I thought about changing the tags to those names, but concluded that leaving them as the species is more informative.) I've also updated a couple of the tags when the scientific name of the species was changed.

If anyone feels like gathering a list of any of oso's mushroom girls on danbooru not present in this image, I can do the same for them, but I doubt I'll find the time otherwise.