Aliasing sheep_(artist) → badsheep
Link to alias

Reason:

"sheep_(artist)" is what's being used on e621 and what has a majority of uploads, but "badsheep" is the name on furaffinity, weasyl, twitter, and tumblr. when people upload their art, i'd imagine they'd go for "badsheep," and may not actually find posts under "sheep_(artist)" unless they already know that's what their name is on e621 (for an example, i did this just yesterday).

https://www.furaffinity.net/user/badsheep/
http://bad-sheep.tumblr.com/
https://twitter.com/badsheepart?lang=en
https://www.weasyl.com/~badsheep

they have a sfw art tumblr listed not under badsheep, but even there, the description says "SFW Blog of Bad-Sheep!" Their personal blog does similar.

https://woolydoodles.tumblr.com/
https://shearsandqueers.tumblr.com/

you could even consider aliasing bad_sheep and bad-sheep but as far as i can tell that hasn't been an issue so far.