The artist has since deleted their pixiv, so those links are mostly now for reference. So far, no other new profile pages have been found for this artist.

(I suspect that this artist created a new alias under ぬこちー. The art styles are pretty consistent (especially looking at the two Typhlosion pictures), and although ぬこちー's account was created before so's, there were no posts on it until well after so decided to jump ship.)