John Lastnamless is just... a dude.

The only interesting thing about him, really, is his last name, which is a description of his austonishing lack of a last name.

also, he has no association with a certain 'Grognack TheDestroyer'. In fact, he has never met such a person. He definately doesn't exist, but if he did, John Lastnamless would have no association whatsoever.