I was weak and voted for my 4 faves.
Buffy - The leader, season 7 showed she deserves to be leader of the group. Has been through so much, lost so much but still got through it and thats inspiring.
Xander - the heart of the group, always there to keep things light and is loyal and brave, if not a bit stupid.
Oz - Willows true love in my opinion. Such a good character, didnt say much but when he talked, it was worth it
Faith - most human out of the three slayers, has insecurities, feels jealous, like everyone and learnt the hard way.