Mostly people seem to want to turn the 'bottom' in fics into girls and then have a lot of het sex. :(
I've noticed that with Stiles in a lot of Sterek fic, but Teen Wolf and sort-of-but-it's-more-complicated-than-it-seems Thor are the only fandoms where I've noticed this pattern. My impression is that in Supernatural, Star Trek, MCU (excluding Loki fics), and Sherlock, it's pretty much a toss-up as to which character gets genderswapped. And in other fandoms like Harry Potter, there may be a most often genderswapped character (Harry himself, in that example), but he's not a bottom in 90+% of the fics featuring him (e.g., as Stiles is), so it's a completely different dynamic.
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I've noticed that with Stiles in a lot of Sterek fic, but Teen Wolf and sort-of-but-it's-more-complicated-than-it-seems Thor are the only fandoms where I've noticed this pattern. My impression is that in Supernatural, Star Trek, MCU (excluding Loki fics), and Sherlock, it's pretty much a toss-up as to which character gets genderswapped. And in other fandoms like Harry Potter, there may be a most often genderswapped character (Harry himself, in that example), but he's not a bottom in 90+% of the fics featuring him (e.g., as Stiles is), so it's a completely different dynamic.