So, one of my favorite pieces of yiff ever (art of a protogen who was apparently named bluejake) got removed, requested by the owner of the character and i cant find pretty much anything on this bluejake character, so I'm wondering, who are they, and who owns them...??? what happened?

if they asked for it to be removed, they didn't want it here anymore. It's unlikely anyone browsing these forums will know who's behind a random character. Their takedown has no information and they deleted their account.

there seem to be some collabs bluejake made with another artist unselles which can be found on the latter's FA:
https://www.furaffinity.net/gallery/unselles/

from my experience on a diffrent booru i help out on. some artist just want to quit. and when they do some want to wipe their existence. it doesnt happen often. but we have had requests like that. its normal.