Akame is just an ordinary member of Night Raid. She doesn't have an integral role in the plot, and she is not an essential character: her absence wouldn't had changed the framework of the story significantly.
Though she did fight an amazing battle, this doesn't seem like it should differentiate her from the others, because all the other members did the same thing. The only difference is that
she fought Esdeath, the primary antagonist, and ultimately survived.
However, on the other hand, the show is named after her. In addition, the opening and ending is full of portrayals of her. She takes most of the attention, but she doesn't seem to display a leading role.
Why is she emphasized so much, especially over the other characters?