Learned a new word today, I'll just paste the definition for others to learn :)
Femby, also known as femenby, finby, fenby, or finenby, is a gender identity for those who identify as feminine and non-binary. https://lgbtqia.wiki/wiki/Femby
Right, soooo that would make him a make following that archetype which was my original question. I'm not a fate expert but I know for example Ferris/Felix is much closer to trans in the source material than they are in the anime
Yes astolfo is probably a man. Especially considering the main characterization of him is being troll-y, he uses masculine pronouns (boku) and Japan knows trans people exist and will actually put them into stories, unlike what the other guy seems to think. Oh and he's confirmed as a man in other material, apparently.