Aliasing melissa_the_hedgehog → atomi-cat
Link to alias

Reason:

Same artist. Artist has two DeviantArt accounts. (and an Atomi-Cat Tumblr)

https://melissathehedgehog.deviantart.com/journal/Farewell-current-age-301915430
announces artist's 2nd account
https://atomi-cat.deviantart.com/ (which has a boring avatar ... default avatar??)

https://atomi-cat.deviantart.com/ (profile page) does link to first account.
(via blog https://atomi-cat.deviantart.com/journal/I-m-now-a-starving-artist-Commisions-anyone-314141028 appearing on profile page)

https://melissathehedgehog.deviantart.com/ (profile page) doesn't mention 2nd account so an uploader to e621 may tag her art as melissa_the_hedgehog.

By the way, that Melissa DA profile page (via featured blog post) links to http://atomi-cat.tumblr.com/