First of all, you shouldn't treat it as a mixable style. No one's interested in secretly vampire or serial killer musicians or actors. Or anything like that. Fanfiction is yet a mix of romance and tabloids or the actual style of the existing work. For sure. You should always keep the style of the yet existing work.
Secondly, the stars or fictional characters should be used like their actual status – or you should at least find an acceptable cause for not being that. You should never be absurd. Today's people have already got disappointed in absurd – they need a story that tells them not to give up even if they're in a big trouble or live in poverty.
Here comes the other important advice: everyone have heard the story of the poor girl who wants to be an author and one day meets The Star (usually because their parents know each other and she must go somewhere while her parents are on holiday or vice versa or they meet on a holiday or IDK but I don't even care) and poor girl have never heard about The Star and after having their troubles they live happily ever after; but because everyone was interested in at least one. If you write it in an unusual way or use an unusual main character you'll be successful.
Never ever write only about having sex (or mostly about having sex). It's like shooting porn staring the star without his/her permission. And if you have never had a personal experience before then chances are that you have no clue how sex works OR you're too young to write about it. Or both. I'm not encouraging you to start your sexual lives early, I'm telling you that porn is bullshit in every (video-recorded or written) form, and is as close to real sex as a plastic apple is to an edible one: nice and everything, but only good for decoration, if you want to use it for its real purpose you fail as soon as you try.
Being said that, always do at least some minimal research and never write about something you don't know. And it doesn't only apply for fanfictions, but for everything, if you just get ideas totally out of the blue you're not worthy to be called a writer, and on the top of that you'll seem ridiculous for those who know something about the topic. I don't ask you to read five theses about the thing you're writing about though, usually ten minutes Wikipedia and understanding, selective reading is enough to collect the basic information you need.
You shouldn't write fanfics that could happen to anyone just for being able to say that hey, I've written a fanfic – take the advantage of the fact that your main character has met a star who has a concrete personality so you don't have to deal with creating personality. Take them to photoshootings, filmshootings or studioworks, concerts, etc. [attention seeker fanfiction is a big NO-NO.
Never leave conflicts out. As they exist in real life as well your characters can't live without them. But don't use too many because it would mean your characters weren't born for each other.
Use dialogues. It can be depressing if you can read he said that... in reported speech all the time (this is a linguistic term, kiddos). But of course sometimes you should use reported speech as well as to make the story a bit faster.
Never forget emotions, allusions and words that modify the way the characters behave.
Although it may seem funny you should never write from one point of view with anyone else. If (s)he wants to join your tale that person should be someone else (for example a sibling, friend or enemy of yours) so one character's POV will be clearly that character's style. This, by the way, can be really disturbing – especially if you write totally differently.
You should never ever assume that the star you are writing about has the same problems as you have (physically/mentally terrorized, secretly has murderer inclination, depressed, uses drugs, etc.) just if it's a proven fact. Again: it's your personal social problem.
And last but not least: don't even think about writing a fanfiction including politics and/or religious views. They are one of the most sensitive parts of people's lives because it's the only thing that they can choose and as everyone has a conviction about them we can't live without them – but we can live without mentioning them directly (if you mention though "I was praying [the] god[s] he would get better", it's something acceptable in my opinion if you don't say anything else about your religious beliefs). And so try not to write about your religious/political views in a fanfic.
If you think that you want to show the world how skilful and breadth minded writer you are but it would mean that you didn't keep at least one of these tips then write a story or even a novel about that without mentioning a star. Thank you.
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