I'm not sure specifically what that particular 'you hit like a girl fanfic' is about as there could be many interpretations. It might be a fan - created story related to a statement 'you hit like a girl' which could be exploring themes of gender stereotypes in fighting or some other related concept.
In Glee fanfiction, 'you hit like a girl' might be a specific line of dialogue. It could imply that the person being referred to has a less forceful or powerful action, similar to the stereotype that girls are not as physically strong. But in the world of Glee, which is full of diverse characters and story arcs, it could also be a way to play with gender roles and expectations within the fan - written stories.
It's probably not a common plot. Glee fanfictions usually revolve around the main aspects of the show such as the competition among the glee clubs, the romances between the characters, and their struggles with self - identity. While this phrase could be part of a story, it's not likely to be the central plot that most fanfictions are built around.
There's no way to determine who the girl was without more details. She could be a local from a lakeside town or a tourist visiting a beach area. It really depends on the context of the particular story.
Kick - Ass himself is an obvious choice. Their partnership in the original works was great, and in fanfiction, it can be explored further, like how they develop a deeper friendship or face challenges that test their alliance.
In the fanfic, the 'gets hit and sees red' situation might be a turning point. For example, if she was previously a meek character, this event could be the catalyst for her to stand up against oppression. Maybe she was hit by a bully or an antagonist, and seeing red means she's now ready to fight back, whether through physical means or by using her wits to outmaneuver her opponents.
One possible plot could be that Lauren is in a state of shock after being hit by the truck. Her friends in the 'Lost Girl' world then rush to her aid. They might use their supernatural powers to try and heal her or at least keep her alive until proper medical help arrives. There could be a lot of emotional turmoil as they fear losing her.
The number of hit girl comics is not easy to determine precisely. It depends on factors like popularity in different regions and publication periods. But there are definitely a significant number out there.