Simple, you remix the project, put your OC on the left box (you can delete the sprite Kirby if you want, you just have to delete the scratch Kirby I made for this example), and I will sprite the OC you put in.
This is my first put your OC here project. I made the Kirby on the left box and added the sprite of Kirby on the right box just for an example. Also, you don't have to do Kirby ones, you can put any of your Mario, Sonic, and ect. OCs in it. P.S: I wanted to do this for my spriting skills. Kirby: Nintendo and Hal Laboratories, Inc.