I saw your post from awhile ago asking about a short superhero graphic novel and thought I would contribute an idea, if you are still looking.
I recently used The Amazing Life of Onion Jack by Joel Priddy with my middle school students and I think it would be totally appropriate for 9th graders, too. The story is short - 10 pages - and requires a lot of reading skills: inference, knowledge of allusion to other superhero stories, plot structure, action = character, and irony - to name a few. At the same time, the story is simple and fun.
The story can be found in the 2006 edition of America’s Best Comics, edited by Harvey Pekar.