I'm pretty personable in general (though I was rather surly in the past), mostly due to a newfound desire to relate more to other people, but I can be somewhat intimidating to people due to my intensity on certain subject matter. However, you're not likely to see this side of me unless you'd like to have a philosophical discussion or debate a point of music theory, mathematics, or something of the like. Other than that, I think people enjoy themselves around me, though I s'pose I can never know for sure.
I'm pretty intense about music, and it actually got to the point that I actually don't like music anymore. I've got a lot to say about this, so maybe you should just ask me in person.
I'm pretty serious in general, but am pretty good at being friendly (at least I think so) and am interested lately in inserting myself into the headspace of whoever I'm speaking with at the moment. I have a very mild humor to me - I'm not one to deliberately try to make people laugh, but a light humor does seem to weave its way through most of my interaction with people.