It's all about timing and chemistry. If the timing is right and we have that chemical connection, we are halfway there. The people I tend to click with are funny, intelligent and kind. Having similar interests is nice, but not a deal breaker. I love tennis, photography, going to the movies (or staying in and watching movies), eating food other people cooked (I'm good at many things...cooking is not one of them), reading, watching and playing sports, and walking on the beach (cliche, but true).
And of course you must be able to leap tall buildings in a single bound!