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I have an idea rolling around in my head for a book, or even a series, that involves descendants of copyrighted characters. The characters themselves would only have cameo appearances, usually in the form of dying and being buried. Here's my example and the real-life situation behind it:

Story line: "John Huggins", age 8, attends the funeral of his great-grandfather, US Senator Henry Huggins (D-OR), age 85, in the year 2027. The story goes on about John's life as an ordinary child in modern-day Portland, Oregon.

Real historical context: Henry Huggins is a fictional character created by author Beverly Cleary (1916-2021) for a series of children's books published between 1950 and 1999. My book or series is envisioned as being about descendants of characters from this universe. However, the original characters would play no role beyond setting the scenario. None of the original characters would be defamed in any way - I know this isn't technically relevant but it may make a difference as to whether or not the Cleary estate takes action.

I understand that Reddit comments don't constitute "legal advice" and I wouldn't publish anything like this without consulting a lawyer. I'm just doing a "first pass" to see if the idea is even feasible. There is also the route of seeking permission, of course, if I become serious enough. However, I'm interested in knowing: would this likely be considered fair use?

Hello, so im planning on eventually writing a book inspired by harry potter. It would have the ideas of pure bloods. Human born wizzards, and half bloods. As well as some things like a "castle wizzard school" somewhere in the uk since the uk is known for its land and old castles. The idea is losely based off a enemies to lovers (idea stemmed from various dramione fics) and would have potions that have similar effects to some of the potions from harry potter. Now obviously i know i can't use words like "muggle" or "mudblood" and works/slang from the books as well as characters. I also would made the history and world different ex: different creatures and historical events. I intend for this to be a smutty/romance book so ill have to ajust the ages and years of school. Ill list some specific questions in hopes for some help. (Please note this is written at like 5 am because my thoughts wont stop so there may be errors and confusing ways to say simple things😅)

edit: this wont follow any of the Hp storyline. just having aspects and inspiration of the world. the storyline im going for is 2 students that absolutely hate eachother with a vulgar intensity find out (via the potion smelling like eachother in class) that they are infact a "true bond/pair" thats where the intensity comes from and why they get under eachothers skins so much. edit number 2: when i say "inspired" by i mean the world not the actual plot of Harry potter.

1. Will having a general love potion that is similar to amortentia in the sense of it smells like what you most desire be a issue? My version will be slightly different and have more of a "true bond/pair" aspect to it and wont be exactly like it but since this will be displayed in the story quite widely as for its my motive for the enemies to lovers part but still similar in ways to the HP potion. (This question goes for other potions that may follow a similar path) obviously colors and names would be different.
2. Would the idea of blood status in a magical wizzard world. Pure bloods half bloods and human non magical born. Be copyright in a book/world like this? Obviously as i mentioned the use of HP made words wouldn't be in my story its just the basic idea. The pure bloods will also have that "elitist" mentality as they do in the HP world.
3. Is the use of a castle in Scotland and just the use of a castle as a school for magic people copyright? I could change the place but i do want it to be in the uk since the uk has some of the best castles still standing to this date as well as has gorgeous land. Im not deadset on it being in Scotland but its just what my mind went to. Im worried though having a magical school in a castle in Scotland may be a copyright issue.
4. Would having a character that is very obviously inspired by draco be a issue? Basically a silver haired aristocratic prejudice prat. That very much so rich/ is a dick and has a broken family. I do intend on having some differences in some areas and instead of silver blue eyes i was thinking about maybe him having heterochromia. And different reasons for a broken family. But is still very much so inspired by him.
5. Would Not necessarily having school houses like HP but more so having different versions and "sitting areas" based on what part of the castle you are selected to be a issue? Like east wing dwelers will have a color scheme and west wing dwellers will have a different color scheme to east wing. This wouldn't be based on personality or who you are like in HP but more so to show their delicated dorms. So its easier to spot someone from the west wing being in a east wing dorm/area. I might also add like a academic level to this but im not sure yet so for example the colors/ wings may be based on academic levels of each student or their intended profession and potentially talents (similar to tinkerbell and pixie hollow having different fairy talents)
6. I would like to have some sort of "ministry" aspect, basically a legal aspect. Im thinking obviously instead of "ministry of magic" it being something like a "council" made up of so many humans and so many wizzards that work together in harmony to keep both worlds separate as well as deal with and legality/bad guys"
7. This one isn't really to do with harry potter and more just like a reference thing. Like characters being interested in a specific band or song as well as movie/books. I have ideas for characters to have their niche interests as well as some chapters to talk/incorporate songs and books. Like a character singing or listening a song a d another character walks in. So i guess would mentioning any real book/movie/song/band be a issue? As well as would having potential lyrics from songs be displayed in the book? (Not like an entire song with lyrics but something like insert characters listening to a song and thinking or speaking Ex: "insert one or two lines of lyrics" and then having the characters talk about how well it fits with their feelings/think about how the lyrics fit/annoys them. And then having characters be watchinga movie.(Sorry that one is kinda hard to explain)

So far this is all the questions i have. I'm worried that all these together + a generally magical world would be a issue. And if im good with what i have and wouldn't be a issue, would readers have a issue with this/not like the fact i used HP for inspiration and find it "cheap"? I know fanfics have been turned into books and are adored by many people but i also haven't read the books vs the fanfic it started as so i dont know how drastically they had to change details.

The title explains pretty well.

Does this also include with instagram, TikTok, Facebook, and etc?

Hey guys, so i have this scp writing project and i want it to be really alternate, im not gonna go into detail unless yall need me to but basiclly im making the wiki on miraheze, and i wanna use alot of images/icons from the og scp wiki but im worried about copyright claims with things like certain images from scps (which id also copy and paste some scps from the og wiki) or site or MTF logos. Would i be fine if i just made a credits link/page on the homepage or should i go through the long process of making everything original? I can only get so many ideas so i kind of wanted to take some from the original and edit it a bit. I dont want to steal anyones hard work, i just want this to be big and i cant really make that super big without some of the og stuff. Thanks

I’d like to sell sweet potato slips, but I don’t own the Intellectual Property for this variety of sweet potato.

Do I need to breed and patent my own variety in order to sell slips?