How to do it? First, go to the project and change the first 4 "Start" sprites to your OC (there can also be more than one). Once you do that, go to the "Edit" sprite and change the first 10 sprites to images. In the last 4, add your character(s), giving them their color in the backlight and that's it. (also changes the thumbnail and the 2 backgrounds) EXAMPLE: https://scratch.mit.edu/projects/1201896170