Celebrities/politicians are treated differently than "private citizens" when it comes to satire/libel/slander because they are public figures; people are going to say mean things about them so it's impossible to totally prevent it from happening. (In the US) The burden of proof is on the person in question to prove that what was said/written about them is untrue AND that it's harmful (what their favorite color is is not harmful, but saying that they cheat on their spouse is). HOWEVER, anyone can take you to court, for any reason, if they want to spend the time/money to file a suit. That is going to cost you time and money to deal with, either by making it go away via dismissal or settling out of court or by fighting it.
There is a very stupid lawsuit that happened about a series of fictional tropes ("omegaverse," it's very NSFW if you choose to look more into it) that was developed by fandoms as a whole. Some people wrote original stories using these tropes, and one of them sued the other for copyright infringement because of it. The books were pulled from Barnes & Noble, Amazon etc and seriously affected sales. The books still exist but they're much more difficult to get. The person didn't win the lawsuit (it would be like if Tolkien's estate claiming copyright over fantasy stories with elves, dwarves and dragons), of course, but it still caused a ton of damage and cost the other person tens of thousands of dollars to deal with it. So if you choose to go ahead as plan this is what you're risking. Please, speak to a lawyer.