>>544876887
>>544877103
>>544877182
Mashu is March/Evernight, the freebie starting waifu girl, at best. Her entire "popularity" rests on being the "first" and "main" girl.
As for the ACTUAL popular FGO waifus
>Jalter is a bit on the older end but still well enough
>BB and Meltryllis are among the franchise's most persistent in popularity
>Kama has since become the top Sakuraface though and is arguably the strongest waifu in FGO
>Or, at the very least, rivaling Morgan for that top spot... Morgan herself showing up to take the top Saberface spot. Rinfaces found dead in a ditch
>Saber retains the mascot popularity like Mash, of course
>Olga Marie mogged Mash to the bench though since Olga technically appears onscreen first in FGO, and Nasu has done a lot of actively shipping with Olga, rather than the de facto kind of passive stuff Mash gets
So if anything, Firefly is probably more like U-Olga Marie Animusphere.

>>544877245
Technically Mash has an internalized virginity protector that causes her to violently destroy would-be virginity takers aside from (You), even when she's memoryless and not in a mental state where she would mind or care.
But it's funny to ship her with Lord Boggart regardless.