I'm not sure if this is the right forum or not, please feel free to point me in a better direction, but.

My forum image was made by a user who was previously named Bats, but either they've changed their username or been frozen. I still want to properly attribute -- all the forumsets I have were made by them -- but I have no idea how to track them down. I want to say they may have been Jocelyn, before being Bats, but this is years-old memory, so I may be wrong. I'd be interested in commissioning them again, as well, but... that does kind of necessitate finding them.

Anyone have any ideas, or happen to know the person I mean?

I believe the person you are looking for changed their username to Delsin.

https://subeta.net/forums.php/read/117152/bats-making-things-for-free

you are my hero today, kind person. thank you!

You're very welcome. Just glad I could help. :)