I've already talked about Fuko a couple of times and it's no secret that I really hate the fact that she's a capable hero who needs rescuing but there might be a reason.

The dumb hero is a popular trope that you normally associate with characters like Goku, Luffy and Naruto, not particularly book smart but more than capable fighters, the trope is almost never applied to a female main character, even Sailor Moon, who would fall under the category doesn't fit the trope entirely as she only fights out of necessity not because she enjoys it, that's the key difference.
Fuko fights Recca all the time and is always lumped in with Recca and Domon instead of the smarter Tokiya and Koganei making her an idiot hero, it gives her a unique standing as a character that no other female in her genre as far as I know has equalled.
Doesn't mean I like her though.