The Ninja isn't just a one-time throw-away gag. Ninja will be a minor recurring character, like Al the Alchemist. And Norm the Norman Knight. Remember him from Comic #56? Of course you don't - nor should you.
I like Ninja - he's very easy to draw.
No, Ninja doesn't have a name like "Drew the Druid" or "Scot the Scotsman". I couldn't find a good name using Ninja or any other synonym. Oh well.