Due to an ion storm and a transporter accident, my evil twin would come from a parallel universe into this one. He would, of course, have a beard.
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(How’s that for bonus points?)
He would sign up for Fluther with the username Chimera and would be an insidious troll. He would analyze the pet peeves and viewpoints of the users and craft his posts specifically to get on their nerves, but not overt enough to get modded (e.g. after a post by gailcalled, he’d be sure give an answer using misspellings like “definately”). He would give an occasional inflammatory answer, and as soon as people responded to it he’d quickly change it to something benign, so their responses would seem ridiculous. He would look through the avatars and send crass PM’s to the cute girls.
In regards to technology, he would believe in DRM and software patents. He would actively try to subvert opensource projects. He’d work for a large company in corporate development (sabotaging smaller companies so that his company could buy them cheaply).
He would be arrogant, egotistical, and self-centered. He would be a litterbug. He would talk on a cellphone while driving. He would park in handicap spaces. He would leave his shopping cart next to another car and drive off. He would turn on the charm when he wanted something, but ignore people when he got what he wanted from them.
(I’d keep going, but I’m really starting to hate this guy)