Single post in Questions About Site Rules 2.0

Hi, I have a question relating to art! I've read through the art rules, but unless I missed something there's nothing relating to this. Are we allowed to make art based off of another franchise and sell it? for example, I'm planning on making custom Demon Slayer characters for people, but I'm not exactly sure what the rules are on that. I won't be tracing or using any official demon slayer images, but I'm planning to create characters that use elements from it - the demon slayer uniforms and the colour-changing katana, for example. sorry if i'm being a bit confusing >w< (I originally posted about this here before someone showing me to this thread)