Well I'm a big fan of mugen portrait presentation. Since I have a grip of portraits I thought I'd share them with you all, to save you time having to search for a specific portrait. All of them are 120 x 140 and all of them use a transparent back round. I'd say about 90% of these are Marvel/DC and Street Fighter/Capcom related. Most of them have been done by someone else, but I did a few as well. Enjoy!
http://www.sendspace.com/file/nfarv3