Dex as seen in SR1. The straight man to Johnny's insanity, the Saints' rash aggressiveness, and the brains behind most of the operation.
It's a complete disservice what they did to him in SR2 characterwise. Not because I don't like the fact he's set up as the next main antagonist in SR2's secret mission, but because how vague they are about his motivations both for dropping his flags (Ultor was nothing but a clothing company in SR1, hardly worth it even if Dex knew the saints had a mole) and deciding to eradicate his former mentor and friends. For a guy who was meticulous and couldn't stop himself from outlining every part of his plans to those who'd listen, it screams rushed writing that he does a 180 and goes silent. Not his MO.