Capricorn (Dec. 22-Jan. 19)
If there was one word to describe a Capricorn best friend, it would be devoted. Capricorns are your ride-or-die, in part because they don't get close and open up with a lot of people. Their quiet nature, exacerbated by their occasional tendency to dislike small-talk and anyone perceived as being lazy, means that they don't have a huge group of friends. Yet, once close, Capricorns are family- and friend-oriented and would do anything for those they love.