Interrobang!? is a favorite, and I’ve mentioned a couple of times that Exapno Mapcase is what I wish I’d thought of when I registered (it’s from Harpo Marx’s autobiography).
And come on, surely I’m not the only person who’ll cast a vote for Anal Scurvy?
I quite like Obsidian Flutterby.
Also, in this very thread, (I thought of it before I saw the post, honestly) CrankyAsAnOldMan.
Haven’t seen him around in a while, but I liked good-old, straightforward lower-case robertliguori as well.
I’m sure I posted in a similar thread about 6 months and thought of a couple of othres that I can’t remember now!
I was really disappointed to find out that was from The Big Lebowski. I’d hoped there was more to the name than that.
And to answer the OP: I don’t see him around a lot, but I still have a fondness for ArrMatey! It’s just such fun to say. Happy Scrappy Hero Pup is also pretty cool.