Important fanfiction rule
An important fanfiction rule?
Hate the WRITING, don't hate the CHARACTER.
When you hate a character on a show, nine times out of ten, you're hating how the character is WRITTEN, and there IS a difference, and a very IMPORTANT one for fanfiction writing. And in fact for adaptations in general.
You see, hating how a character is WRITTEN means you acknowledge their depiction is fluid. It can be changed. By hating the CHARACTER, you are hating them on principle. They become static and it becomes hard not to...punish them so to speak.
See Scrappy Do's depictions in the movies, TV series, and comics since his run as a main character ended for a good example.
There's pitfalls even when writing a character you LIKE (for example, making them TOO fortunate), there's a LOT more when writing a character you HATE.
Now, if you hate how the character is WRITTEN rather than the character themselves, well then that opens up possibilities, as YOU'RE writing now. You can now address that. You can address