The seat is taken by a future Blade gang member. Maybe you could get rid of the guy by messing with the tattoo?
This is the low-spoiler guide for "Freeing the tattoo seat" puzzle in VirtuaVerse. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.