It was really cool to see the Pink Knight (from Castle Crashers) and the Ninja (from N+) in the XBLA version of the game, but they didn't play all that differently from Meat Boy. More so, they didn't make the excruciating task of getting a 100% on the game (and getting that final unlockable character) all that much easier.
That's why I'm not that sad to see them swapped out for these new characters in the PC version of the game. As you can see in the video above, Captain Viridian (from VVVVVV) is a total cheater, and it's awesome. Teamed with Mr. Minecraft (and his similarly game-breaking abilities), I figure that I might finally be able to score that 100% completed bonus.
Or not. Seriously, I don't think it's possible for my brain to ever guide my hands towards making the right movements to beat the dark world version of Chapter 6. The brain simply wont abide.