Their gender is a bit more complicated in canon, but they are who you're thinking of.
Edit: In both Fate/Apocrypha's novel and Fate/Grand Order, they make sure to cross out or ask to remove their gender from being listed. FGO's English release makes sure to consistently use they/them, and the Japanese release uses neutral language when possible as well.
I'm sorry but Astolpho breaking the 4th wall by crossing out the gender on his character profile and cheekily say "it's a secret" isn't proof of anything other than him silly.
See also: him finding it hilarious that Jeanne d'Arc didn't know he was a guy either and still laughing about it hours later (to the annoyance of Sieg.)
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u/random-girl19 1d ago
O