Last week was a busy one when it comes to good comments, with thoughtful and funny ones about the Navy Yard Metro, Columbia Heights Day’s existence, avatars, and more. And speaking of avatars, why not set up your own? Maybe you can be like monkeyrotica, who was the talk of DCist’s commentariat — what’s his going to be? Something profane? Something phallic? Mr. Monkey’s response was this: For an avatar, I was about to go…