Are random generators that use the names of fictional characters not infringing? For example, if I create a random generator that uses the names of the characters from a Multiplayer Online Battle Arena (MOBA) video game plus a random string attached after the character name, and also release the source code of this generator to the public (for demonstrative purposes), is this an IP infringement? In order to achieve this I (in this case) would have to include the names of the characters in the source code.
You would be in poorly-tested waters under US law. The invented name &quot;Cthulhu&quot; as appearing in a novel is not protected by copyright. A collection of invented names and other words assembled into a dictionary (e.g. of Klingon) might be found to constitute a copyright-protected creative work. In Paramount Pictures v. Axanar Productions (complaint), plaintiffs partially base their claim on infringement of language; defendants sought to dismiss the suit on various grounds (&quot;questions of law&quot; rather than questions of fact), but the court denied defendant's motion for summary judgment. Subsequently, defendants settled the case. Constructed languages are highly creative expressive works whose elements are deliberately selected for an artistic purpose, and they are not naturally-occurring facts. The copyright office has no position on copyright protection of a constructed language, and any such position would have to come from so-far non-existent (definitive) case law. The dismissal in Paramount v. Axanar doesn't clearly indicate that a constructed language is protected. The primary legal question would be whether the database that you copy into your system is protected. There is a colorable legal argument that a collection of language-like objects. The statutory language in 17 USC 102 does not specifically preclude protection of a wholely-creative database, and the copyright office does not say whether a conlang can be protected because the courts have not ruled one way or the other. The situation in Feist is very different from the case of a work which invents a language from nothing.
In general this kind of brief literary reference is not unlawful, and such things occur in both novels and commercial games with some frequency. Making such a reference a major part of the plot, such as by using a name from a previous work as a major character, particularly if other aspects of that character are also used, is far more likely to cause a problem. In the united-states this would be a matter of fair use. In general, when only a very small part of the source work is used, such a a single name; where the use is &quot;transformative&quot;, that is used for a rather different purpose than in the source work; where the use does not harm the market for the original work; and where the use does not serve as a replacement for the original, it is likely to be held to be fair use. But fair use decisions are always fact-dependent, and are made case-by-case, so it is hard to be absolutely sure of one in advance. But the kind of literary reference described in the question is very unlikely to be held to be copyright infringement.
There is no general prohibition against taking down material, even non-infringing material, which is posted by some person, but there is a risk to the service provider. Abstracting away from the specifics of github, a Provider has some agreement with the User whereby User rightfully makes Stuff available on Provider's site. Arbitrarily removing Stuff (in violation of the usage agreement) may cause damage to User, who may sue Provider, and Provider will avoid that if possible. DMCA protects Provider from copyright infringement suits by Victim, providing the proper DMCA procedure is followed, and it allows Provider to remove Stuff without fear of getting sued by User (17 USC 512(g)). This protection is not available if the takedown notice is not proper. (As a case in point, the entire series of Harry Potter books is still out there freely on the internet, because only the rights holder can demand a takedown, and the rights holder seems to not be concerned).
The general idea of such an app is not subject to copyright protection. Ideas never are protected by copyright. So creating an app based on the functionality of a fictional app would not be a copyright violation. The logo might, if it is original enough, be protected by copyright. Any or all of the "name, the logo and the color scheme" might well be subject to trademark protection. (Names and other short phrases are not protected by copyright.) You would be wise not to use these identifying elements of the show, but instead create ones sufficiently different that no reasonable person would be confused into thinking that your app had been used on the show, or was sponsored, endorse, or approved by the show or its creators. An explicit disclaimer saying that you are in no way associated with the show or its creators, and your app is not approved by or endorsed by them would also be wise. Otherwise you might be accused of trying to pass off your work as affiliated with they show, or to trade on the show's reputation and fame. Whether you make your app an open source work is not in any way relevant to copyright or trademark claims. Whether you charge for your app is of only limited relevance to a copyright claim. Whether you sell or market your app, or use it to advertise some other product or service is relevant to a trademark claim, as trademarks are only protected against their use "in trade" which generally means commercially. However, non-commercial use of a trademark may constitute "dilution" of the mark, which may give rise to a cause of action against the person using it.
That would be pretty much a classical case of copyright infringement. Drawing a thing from memory is copying just as much as drawing a thing with the original before you or xeroxing a thing. The degree of match between the original and your copy may vary depending on how good your memory is, but that doesn't matter, because copyright protection is not about "making exact replicas", it is about copying in any form.
Q1 and Q2 are definitely not copyright violations. Copyright protects original expression. Your questions are yours; the only things you are using are the names, and copyright doesn't cover them on their own. The quotation in Q3 might conceivably come under copyright. However in practice it is very likely to be fair use (unfortunately nothing is definitely fair use until a court rules on it, but I can't imagine a short quotation in a quiz being an issue).
No, it means you can't copy it. By default, the copyright to a work is owned by its creator, and nobody else is allowed to copy it, or create derived works, without their permission. That permission can be granted by a license. "License unknown" doesn't really tell us anything, but it certainly isn't clearly granting you permission. So you don't have permission to copy, and thus you cannot. You would have to seek permission from the copyright holder. See also If no licence is distributed with an application/source code, what license applies by default if any? (Some jurisdictions do allow for "fair use" exceptions, which allow you to copy a work without permission. You haven't said what jurisdiction you are in.)
Your example powers are tropes and their basis in public domain The Queen of Pain's scream is modeled after the Banshee, which had a scream that would kill... and there are LOTS of variants of Banshee. In fact, &quot;Our Banshees Are Louder&quot; is a trope. Hiding in a shadow or walking through it is for example a typical feature of Ninja stories since the Edo Period, and a common Trope as &quot;Shadow walker&quot;. That makes those two powers older than You can not have a copyright on concepts, facts, or ideas. Facts are not copyrightable, which was decided LONG ago over Feist v Rural. Neither can you copyright concepts or ideas. You won't get a claim on the concept of a damaging scream or turning into shadow. See also Copyright.gov (emphasis mine): How do I protect my idea? Copyright does not protect ideas, concepts, systems, or methods of doing something. You may express your ideas in writing or drawings and claim copyright in your description, but be aware that copyright will not protect the idea itself as revealed in your written or artistic work.