It's very possible that Kevin Spacey was playing the exact same character in The Usual Suspects and Seven. Then again, it's also possible that Kevin Spacey was playing two very similar characters in two movies that liked to call him the devil. But you decide.
Vimeo user Tony Stark has a theory that Kaiser Soze and John Doe are the same person. It's intriguing, but we're not so sure. One thing we do know, the year of 1995 was absolutely insane for murder thrillers!