Thread:Hitsuji Mamoru/@comment-27175829-20181205191150/@comment-4802891-20181206041655

Hello.

Astolfo's sex isn't disclosed in the game -- and by extension, isn't here either -- because Astolfo asked for it (that's a legit 4th wall breaking moment). For gameplay purposes, it affects how gender-focused buffs/debuffs/damage work: if a skill is supposed to stun males, it won't affect Astolfo. If it is supposed to do extra damage to females, it won't affect Astolfo etc.

Other Servants with the same kind of effects are D'Eon (who can be both -- historically male though), Enkidu (who is genderless) and recently the Emperor of China (who lost his gender).