Who would you want to sit next to on a cross country flight?

I’m flying from the east coast (Philadelphia) to the west coast (Seattle) today by myself. The topic came up in chat and we were talking about who we would want to sit next to on the flight (not counting significant others). It was an interesting conversation, so I figured I’d bring it to all of fluther as well. So, who would you want to sit next to for the flight and why?