Artist changed names, apparently.

http://www.furaffinity.net/user/ruisu-kun/
http://www.furaffinity.net/user/tattoorexy/

If approved, there are some character names that ought to be changed as well, though that can be done manually:

https://e621.net/tag?name=*ruisu-kun*&type=&order=count

Also relevant, a previous name currently aliased to ruisu-kun:

https://e621.net/wiki/show?title=charimod

It wouldn't let me create this alias through the suggestion tool, saying that "ruisu-kun is already aliased to something" despite the fact that the opposite is true.

I'm kind of worried about this thread getting lost in the mists of time considering I was for whatever reason unable to create a proper alias suggestion for it.