Hi there. Here's my doubt: I want to upload a fan-comic/fic I made using sprites and stuff from a game series, some are modified and other are not, of course non-profit at all. I made it in Twine, it's mostly text and has some images here and there where I used the scenarios, sprites and characters from that game. Is there any problem with that?

Fan works are welcome here. It's just that if the rightsholders complain, we'll have to take action.