[Archon_Wing]

Mari Makinami is arguably a very interesting example to the point whether or not I think they did it on purpose.

She's highly competent, manages to steal a mech that only a few can pilot and is just shoehorned into the story and is able to give the MC life changing advice even when they don't know each other and somehow manages to get accepted by everyone. She ultimately adds nothing to the plot, but still manages to get entire chunks of the movie devoted to her.