You know, I realized something: Marth fangirls are just the same as Loki fangirls.
Think about it: they all became obsessed with the character most knowing him through a big crossover something, pairing with all the rest of the cast for the sake of aving something to schlick to.
Yet, in reality most know absolutely nothing about the character from the source material.
Most Marth fangirls have never played FE1 or FE3 (which with ROMs and fan translations there's no excuse no to), they don't know his personality, they don't know about his family; they only care that he appears in Smash Bros.
I've only seen one Marth fangirl that has actually played his games, and even so she was much more tolerable than most.
Likewise Loki fangirls have never grabbed a Thor comic (many free comic readers and sites where can download comics them gives no excuse not to), how would they react to his Silver Age look? Or the time where he was reborn as a woman? Better yet, how about actual mythology? What about the time where he impregnated a horse? They only care for him because movies.
I've never seen a fangirl screaming of excitement over any pre-Avengers stuff of him, or when he appeared in Ultimate Spider-Man (partly justified with the cartoon hate, but still), or that Avengers anime, or his figure in Disney Infinity, or any other game he's appeared in, or most importantly, any comic he's feautured in.