This article expands on military in superhero movies. It discusses the militarization of the heroes in these films and how the violence and weaponry have shifted from fantasy to hyper-realism. I think it raises some interesting points.

A very interesting article on civilian casualties in superhero movies. Has some interesting statistical type information and can be a good article to cite if your research paper has to do with a superhero interacting with the civilian population.

This is an excellent article on diversity amongst superheroes. It is fairly detailed and scholarly, as well as credible.