Animation Video Copywrite?


New member
Hello there! I run a YouTube channel at almost 1,000 subs. I post animations and tutorial videos. I didn't see this anywhere in the FAQs so I hope someone can help me with this.

I animate a South Park fan series and a Pokemon fan series. I animate myself but use a similar/the same animation style. I use different people for voices to impersonate the characters but rig backgrounds from the show for the characters to interact with.
YouTube seems to be fine with this but would Rumble have an issue? Would it be owned and distributed cause issues as the franchise is owned?
Also just a quick question of if there's a max upload time here. Hope to hear an answer asap so I can post here safely. Thanks in advance.