“Spike is an antihero in the true sense of the word, he is morally ambiguous and ready to fight pretty much anyone, for fun. But underneath it all, he loves deeply and earnestly in a way that remains achingly human. Although, ironically, his personality remains pretty much the same, whether he has a soul or not”x
Vampires are supposed to be utterly demoniac but Spike is not, that’s why he had troubles separating his mother from the demon when he turned her. His humanity is a part of him that he assumes and uses. He is a skilled analyst who can see through people’s walls , he is insightful and very intelligent. He seeks the slayer out whereas she is everyone’s nightmares, he wants to feel everything. He is unique. That’s what make him one of the most dangerous vampires ever.