I know a couple of my friends did awhile back. At least, I think they did. I was wondering if perhaps, this was still possible?

You use that

Yes there is. :) You have to either buy an [Identity Star Shuriken] At the Cash shop or in user shops. Once you have it in our inventory click "Use". :) Then it will let you enter a name. :) The name must not be taken by someone though.