Hmmm.
Mando's — I have tried a few different times to write them, and I just can't get invested. Not sure why, because I've written other characters with warrior-based cultures and loved and became very invested in them. Part of it is probably getting put off by how opinionated the writers tend to be about what is/isn't a proper mandalorian.
Sith — I don't have it in me to get into that twisted mindset, at least not for a prolonged period. I could never have a main character that is Sith. But I think this goes for darker characters in general. I like to get deep into a characters mindset, and that's just not a head space I want to occupy for long. If I had a character that was Sith, it'd probably come about as the plan of a fall of some sort, with either a redemption arc in mind, or their end.
Male characters — Less that I can't write them, and more that they all turn into Dean Winchesters. I tried to change this with my character Anders and was semi-successful, though I didn't end up writing him long enough to see where it would go.
Overpowered Force Users — I'm an Andor lover. I like Force powers that are a bit more grounded in reality, I like my characters to struggle, and for things to not come easily to them. I want story, not to be the biggest and baddest. Sometimes I feel like it's hard to avoid on Chaos, because there are so many over powered characters that you have to dive into more extreme Force abilities, or be really good about writing around them and finding creative solutions, just to be on par with what others are writing, specifically in PVP encounters. But, trying to write that, I zone out and get uninterested really quickly.
Cutesy Slice of Life — Unless it serves a specific purpose to further important development, or it's being used as a juxtaposition, I have a hard time writing things like... Shopping threads, beach threads, coffee runs with other characters, etc. I have tried and I always end up dropping them. I think because I can go do these things in real life if I wanted to, so when I write, I want to write about the fantastical and things that are out of the ordinary.
PVP with no story — Treating writing like a game to win, rather than a story to tell, just doesn't interest me. I can't write characters who only show up to war post and never go any deeper into their psyche or who they are. I enjoy figuring out what makes a character tick, what drives them to fight in the first place, why that is important to them, and getting into all the particulars.