Once Upon a Fic Exchange

Mostly right! It's for creatures that exist mostly as a 'hey, this is a creature' but have no good source or real story to use as canon so they can be nominated on their own. I've given it some thought and decided to give them an umbrella 'fandom' of Mythical Creature.

As well, I did a bit of googling and found that the main stories seem to all be in Japanese but there's an excellent page with summaries that would make a good source for people to learn/write about your nomination. So the guideline for this nomination (which will be clarified in the nominations FAQ) I will give is:

EDIT: this is apparently not allowed as it's a freeform tag in the fandom. I will accept your nomination as it is. Fandom: Mythical Creature

Character tag: Jorōgumo (Japanese Folklore)

However, since I see you've already nominated I'll just adjust it to that guideline and accept it! No need for you to edit.