Cheatball

From Homestar Runner Wiki

20X6 The Cheat first appears in the Scrolling Shooter Games Menu. If you pick up the Cheat-textured "C" pill, your ship becomes a The Cheat-styled fighter, and the game-describing avatar becomes the 20X6 version of The Cheat. He bears a resemblance to The Cheat from an easter egg in 2 years.

In the DVD commentary for japanese cartoon, The Brothers Chaps point out that the spaceship seen in the email was originally going to be the 20X6 The Cheat, and agree that maybe they should still use it as the 20X6 The Cheat. This may be a reference to Tenchi Muyo, which featured a strange creature called a cabbit that could turn into a spaceship.

If the above is true, then 20X6 The Cheat makes a quick cameo in level 5 of Stinkoman 20X6, where he (it?) flies past 1-Up very quickly at the start of Level 5.1.