For anyone who has Bit.Trip Runner 2, I would not recommend the "Good Friends Character Pack". It's a piece of DLC, currently $1.01, that adds Machinarium's Josef, Spelunky Guy, Dr. Fetus (Meat Boy), Raz (Psychonauts), Quote (Cave Story), Atlas (Portal 2), and an invisible skin to make the game harder.
All of the characters in the main game have 8-10 costumes each, and I bought the DLC assuming the DLC characters would also have multiple costumes. Instead, they only have one costume each. I mean, they're all there and they have unique animations and it's cute and stuff, but they only have their base costumes. So I was a little surprised by that. The DLC didn't explicitly advertise that they would have multiple costumes, so it's obviously my error and I don't feel robbed or anything, but I'm just saying it's not super substantial and I wouldn't recommend it.