So if I were to provide work that shows concept art of illustrated weapons and characters fron adobe illustrator/ inkscape, it would be sequential and panel to panel right?
And pin ups would be just various works that include projects done for school right? They vary from making a logo and a car on Illustartor, a magazine in InDesign, and a poster from photoshop.
Also the reason I thought they may accept a variety of work (or pinups) as opposes to sequential portfolio because the descriptions on that link say I should demonstrate experience in adobe ilustrator, photoshop, and InDesign. To me doing sequential art seems to contradict this because I would be using one art style only. Furthermore, I read that if I am just starting out, a student portfolio should have a wide range of art works in different styles.
Sounds like your art isn't really going to be an issue - the job descriptions sound like a lot of paperwork, a bit of layout work, and handling of other people's artwork. Admittedly I didn't read them all, but the ones I did led me to believe that this is more of an office job where you will have to occasionally use indesign, not an art internship, per say.
As far as a portfolio for starting out, well, that's a whole ordeal nowadays. I honestly don't know if there's a straightforward way into the industry anymore. None of the big companies take open submissions anymore, aside from the DC talent search. Your best bet for a portfolio is lots of sequential pages. Lots and lots and lots. That's the easiest way to separate yourself from a lot of potential applicants with portfolios full of pinups.