Most of my friends at school are these sort of academic, nerdy types, but I wouldn't say I'm the most attracted to them, we were just sort of grouped together by default
The ones I find myself talking most to are those who share my interests mainly- I'm usually fairly quiet, but I remember being grouped with someone who knew a lot about a subject I was interested in during an assignment and talking a mile a minute, asking him all sorts of different questions. The ones who I want to approach, but can't are just that- after having a conversation with someone that I find interesting, I'm often left unable to approach them because I can be a bit shy and worry they may find me annoying or boring. I end up relying on them to initiate more conversation, which is how I ended up making a lot of friends in life.
I don't enjoy going out much, but when I do go out, I think I like people who can sort of gently bring me out of my shell while still respecting my boundaries and not being annoyed when I end up clinging to them all night
If it helps, the ones I'm least attracted to are the ones I perceive as "fake"- I can be quite a judgmental person in this regard, and can be a little elitist- if I perceive someone as better than me, I have to assume that they're actually boring and mundane to make myself feel better. It's irrational and very mean, and I feel a little bad about this, but it is what it is.