Spock is unlike many Vulcans or Humans. He has a form of logic that is unlike many Vulcans, and he uses his Human emotions to make very effective decisions. He often questions people's logic for some decisions, as many Vulcans do. He is determined to help his friends, his people, and the Federation. During some point in the 24th century, he grew to accept his human emotions. He doesn't try to repress them as much as other Vulcans, but he can still out-think many opponents. This makes him think differently than Vulcans, but many times this is a good thing. His personality can be futher explained in his article.