Hlootoo's Art

kaialone:

Little thing I noticed about Arachnia(Jorōgumo)’s spider form

The legs of Arachnia’s spider form have prominent yellow stripes,

which kinda is a lot like the yellow stripes that the females of the spider
Nephila clavata are know for.

In Japan these spiders are actually known as
Jorōgumo, named for the same yokai that Arachnia is named after (in japanese), so this is more than likely an intentional detail.