Buffy the Vampire Slayer. Willow Rosenberg. Overview: From Shy Nerd to Powerful Witch. Buffy's Best Friend & Tech-Savvy Sorceress. Balancing Knowledge, Love & Dark Magic. Powers & Abilities: Advanced Witchcraft & Spells, Telekinesis & Energy Blasts, Reality-Altering Magic, Computer Hacking Skills, Occult Research, Empathic Intuition. Books: Spells,