Everything you say is correct from a legal standpoint, and I will study this as a law student. As you say, characters can be exploited and profited from even if they are protected. All companies turn a blind eye to doujinshi artists because their profits are small. Compared to what this partnership earns and the fact that no one has claimed ownership of the character, for example all hentai manga are seriously classified as parodies, even if they pay me a ton of money. I will not file cases over this number, as they are so numerous that each case may take at least two weeks. Literally, you will die before that. It terminates half of them, and this is considered a main reason for the neglect of personal rights in this case The matter would be radically different if someone made a huge amount of money from material containing that character. Let's say someone made a video about the character and that video got millions of views and the person ended up making an entire series. If he earns more than five pounds from that series, then the real owners of the character will file a lawsuit, but if it was just a video that barely earned a hundred dollars, they will have the right to file a lawsuit as well, but it will not be taken seriously. The judge will even side with the defendant