We often think of Bones as the grumpy old man who says, "dammit Jim," and, "I'm a doctor, not a..." Well, he's a bit more than that, to say the least. Bones is a skilled doctor, yes, but he is the emotional Yang to Spock's Ying. He is passionate and driven. The loss of life, even for his enemies, is unacceptable as there is always another way. For a nerd, he is also quite the ladies man, as you can see in the episode "Shore Leave" where he is making time with Yeoman Tonia Barrows.
One could go on, but for a nerd I am shockingly not all that into minutiae. You can read all about Bones at the excellent Memory-Alpha, The Star Trek wiki.
Bones and Barrows from "Shore Leave"