William "Spike" Pratt, vampire with a complex moral journey. Bleached blonde hair, leather duster, and a permanent smirk. British accent and penchant for colorful insults. Initially a ruthless killer, evolves into an ally and eventually a champion. Known for his tumultuous relationship with Buffy and his transformation from soulless vampire to ensouled hero. Represents the capacity for redemption and the power of love to change even the darkest hearts.