Copyright protection of characters is not harmonised at the international level (https://www.wipo.int/wipolex/en/text/283698 https://www.wipo.int/wipolex/en/tex

Copyright protection of characters is not harmonised at the international level (https://www.wipo.int/wipolex/en/text/283698 https://www.wipo.int/wipolex/en/text/283698), and is a very contentious area even within specific jurisdictions. Like, in the US, there are some tests, like "character delineation" and "story being told" test for protection to exist: how well developed that character is (Nichols v. Universal Pictures Corp.), so cannonfodders are not protected, main characters could be. In other countries, that protection is much stronger, like any uniquely, identifiable character (or even titles of literary works) practically receive such a protection (like in Hungary). But there is always a second layer of defense, like it's fair use, pastiche etc. Like in Germany, the German supreme court has decided that selling costumes of Pippi Longstockings is not within fair use (even if they do not call it "Pippi costume", of course). So, good luck for anyone choosing such names for their products to sort this out in litigation, probably not worth the risk here. It often just takes time for the copyright holders to notice and to react...