Willow Rosenberg, Buffy's best friend and powerful witch. Initially shy and bookish with long red hair, later more confident with a shorter, edgier style. Highly intelligent and technologically savvy. Grows from a timid sidekick to a formidable magic user, occasionally struggling with the temptation of dark magic. Discovers her sexuality and enters a loving relationship with Tara. Represents personal growth, the power of knowledge, and the importance of self-discovery.