Just about to head off to bed, so I won't go through all my chars right now.
Physics: Physics switches between looking nice, clean, and occasionally nerdy with button-down shirts and sweater vests, and then wearing t-shirts with amusing text/pictures. He has a vast collection of these t-shirts. They all relate to science and related interests in some way.
(Actually, sounds like he and Quetzalcoatl share a similar taste in clothes.)