Many of my favorite tropes have come across before in my meta and other pieces. Crystal Dragon Jesus (specifically the popular pseudo-Catholic version), impoverished patricians, gendered roles/gender play in M/M sex or relationships (not exclusively the province of fetishizing yaoi fangirls, imagine that!), that sort of thing. One relationship dynamic I do enjoy but don’t talk about much is that between a noble or upper-class person and their servant or other subordinate. It’s one of the reasons I don’t mind, erm, Disney Prince Seth in Seth/Eirika fanon very much or that what I’d probably most look forward to in a remake of FE6 would be Perceval/Elffin.
As for headcanons…gay headcanons are obviously my bread and butter and best expressed through my Mercilessly Judging series, and even some of thoughts I have on media not directly tied to sexuality tend to play into that in some way. My headcanon for what’s up with Priam, for example, or that long set of posts I did on Mako from The Legend of Korra which boiled down to why his series-long character arc is much more fulfilling if one headcanons him as bi. Hmm, does my theory about Tellius and the Fates continent being part of the same landmass count as headcanon?