@EtanRed
Sure, actual queens are a go. If they were known to lead warriors into battle on the front lines. Ie warrior queens.
Aud seems to be a matriarch, not really a warrior or leader of warriors into combat.
Khutulum, is she the one who wrestled men to decide who could marry her and thus ended up with a lot of horses after beating them all ? Famous, but not really for her fighting skills or leadership.
Actress / Duelist isn't really the same thing as what Jeanne did.
Okay, I might've been very selective about the time period, but anything later than medieval times when firearms were introduced is a no-go, because tactics started changing then and women were even less common than they already were afterwards due to organizational changes in militaries.
@aFFi
They've already covered samurai in this manga, if they kept on adding more it would be too blatant.
Not sure when Lady Trieu was about but she might not really have an easy time adapting to medieval conditions
Lozen might be interesting, but she's probably nowhere near famous enough.
Calamity Jane would have to relearn all the local 'wildlife's' tracks and such, and be relying on firearms.
Amazons would probably not really adapt to the MC's character that well.
@Iume
Grace seems to have been famous for supporting others in wars, but the few sites I found didn't mention anything of her actually leading troops into combat or as a commander.
Hippolyta actually has no proof of her existence, or if the claims of her deeds are of one actual woman.
Matilda seems to have been a pretty skilled woman, but like Grace the sites I found didn't mention anything of her being a commander, and she would seem to be more suitable as an administrator, but the MC wouldn't have any need for them at this time.
@Aids
Boudicca was the one I was pretty sure someone would mention.
Madame ching i'm aware of.
Okay, so i've responded to all the comments individually and the common ones are at the bottom, but i'll try to mention a few points if you want to give more suggestions.
[ul]Actual historical person
Very famous internationally
Known to have led troops either from the front or just behind, but not someone who's never been in the thick of combat as a tactician
Considering technological differences, noone who's relied only on guns , because of ammo shortages.
And someone who's likely to atleast have been known in Japan for some reason. Because this is targeted to Japanese.[/ul]
Perhaps you'll think i'm being extremely selective. But considering my points, you might realize that i'm just being honest.