'ツクシ' can also be translated as 'Tsukushi' when using the romanizaiton of Bugsy's name.

Also, there is already an artist named 'ooo' but whenever I try to create the tag it mistakes it for a different artist who has the same name.

Here is the page of the artist who made this: https://www.pixiv.net/en/users/1348651

I could use the alternative name of the artist, yes, but it's unknown whether they use another name for themselves.

Thank you somebody for adding the artist. I did not know the alternative name for the artist until this happened.