My first Tav was a Thiefling ranger.
One of the things that I liked about this race was that Larian used it to show prejudice and racism.
My current Tav is a full Drow follower of Loth (not so much, he has discovered the pleasures of Loviathar), he is a Shield Master. I like the race, in this case because Larian used it to show self entitlement and prejudice (in the case of this race the prejudice goes both ways).
Usually I like to play mixed blood characaters (maybe because I myself am a cocktail of ethnics), indeed my next characters [the fraternal twins of my Drow fighter] are going to be one an half wood elf (with drow somatic traits) and the other one an half - drow (with wood elven somatic traits).
[Also I hope when the full game is released there are going to be more mixed bloodlines, oh how much I would love to play an hal thiefling - half elf/drow or an half thiefling - half human]
About classes I more inclined to ranged ones that is wizards and rangers, but like with races I love mixed classes (that is I love multi class characters).