I signed up asking for something in the Marvel fandom: MCU/Agents of S.H.I.E.L.D./comics-verse/616. There's a lot within those bounds that I love a lot, but here are a few specifics:
My main dude pairings are Tony/Steve and Clint/Coulson, and most of the things I read are about them.
But I love the ladies, so I ship pretty much ALL the het pairings too. Darcy/everyone/anyone is what I listen to the most, Jane is amazing, Natasha is kick-ass, Jan is my actual fav from comics, Kate Biship is love, Skye has become my favourite part of AoS, Skye/Simmons is great (Skye/Simmons/Tripp is <3 too!), I love Melinda May. I don't know as much about the other comics women, but I'd be 10000% down for learning more.
Things that I love (an incomplete list): Women (both canon and gender swap), trans characters, found family, pretend dating (really, most harlequin-type storylines), canon fic, AUs, origin stories, power dynamics (including D/s and BDSM), emotional punches in the gut, poly relationships, and way more than I can think of at the moment.
I don't have many no go zones but cannibalism and killing people in a fetishized way are really hard stops for me. Detailed gore one a large scale also makes me queasy and I'm not a fan of horror. I'm also kind of hesitant about stores with cheating? If the cheating is actually addressed in the story, I'm generally ok with it, but if it's handwaved or something, that tends to make me sad.
Character-wise, I have no interest in Ward-apologists and find that even stories that feature Ward highly that are set before the reveal don't do it for me. I'm also really wary of Loki-apologists. Like, I can take Thor forgiving him, and there are some stories that completely rewrite his motivations for his actions that I've enjoyed, but for the most part I can't really believe that everyone will forgive or like Loki after he tried to take over the world. So.