So King Arthur in Japan is just English flavored Joan of Arc.
Lot of gender bent in the fate series. Basically she’s a woman that pretended to be a young looking man though Merlins magic and emotionally didn’t felt like a king which led to issues with her reign. If interested, start with fate zero there but it is a rabbit hole.
Mordred is also a woman with two mothers there, conceived with the help of some magic.
Fate was a rabbit hole that I still haven’t found the bottom of. I had trouble finding a proper watch order.
Tbf, thats very similar our pantomimes.
Relevant and recent smbc https://www.smbc-comics.com/comic/arthur
Any one interested in a meta fictional look at The Matter of Britain should read the comic series Once and Future. It’s simply superb
Also, quite interestingly, the accurate one should include “depression”.
One of King Charles’s names is Arthur.
Amazing, do you have a link to the OP?