There is the matter that most writers tend to be male, and as such may find a female to male swap harder to write. However, that still probably wouldn't account for just how big the difference is, so there may well be some underlying social/cultural factors at play here*
On the cultural side of explanations, it's worth noting that this disproportion of examples seems to be reflected when it comes to transgendered characters. Specifically, transmale character are far, far, less common than transfemale ones. Whether this correlation stems from any similar factors or is just coincidental I don't know.
*IIRC there does exist something of a male-to-female gender swap fetish group but I'm not sure if that accounts for much outside of webcomics. Then again, rather a lot of gender-swap examples do seem to come from the world of webcomics...
Originally Posted by
PlusSixPelican
MISFILE
How did no one mention Misfile. It handles this kind of thing rather seriously.
Probably because that webcomic is (like practically every gender swap webcomic in existence) about someone who is male being turned female. I'll grant that it's handled somewhat better than some other webcomics I've webcomics I've had the misfortune of encountering, but it's still not a relevant example.
In other words, it isn't an example of a female to male gender-swap.
Originally Posted by
Deepbluediver
I've seen Escaflowne, and as I recall, this one really seemed to come out of nowhere in the second-to-last episode. It brought on one of those collective "WTF?!?" moments in our group. Still, it qualifies, I guess.
It is actually hinted at a bit earlier in the series, but it very much a surprise plot twist/reveal (one that I unfortunately had spoiled for me a good while before it came-up). I'd be a bit hesitant about including it even it weren't a massive spoiler.
Spoiler
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I mean, it's less a case of a character being turned into a different gender as it was a character who had been turned into a different person (without any memories of who they'd been previously) who was of the opposite sex.