take any of my characters and draw them doing whatever you want. Pair them with my other OCs, pair them with your own, or have them being sexy by themselves. it's all up to you - I like surprises
Canon characters? Characters that are not your own creation?
Well.. that really depends on your specialty. For example- I offered Darside_of_felix a spot here because he specializes in fan erotica of TF2 characters. He's so good at it that it's unbelievable. He would be a special case.