3. The Charmed Ones (Charmed) & Willow Rosenberg (Buffy The Vampire Slayer)
The Charmed Ones are a sisterhood of witches, who are known as the most powerful witches ever to walk the Earth, and are dedicated to protecting innocents and ridding the world of evil. They can cast spells and create magic potions and they possess powers such as telekinesis, molecular immobilization and premonition, as well as 'the power of three' whereby they can combine their power to amplify the effects. Willow is a self-taught witch who started out as a meek and largely unassertive computer nerd but eventually grew to be a powerful and authoritative individual. She is an accomplished spell-caster and possesses powers such as telekinesis, magical force-fields, healing, teleportation and energy blasts. I can see Willow getting along very well with the Halliwell sisters and the four of them could learn a lot from each other. Should they come up against a common foe, they would make a very formidable team of witches and I'm sure they would have appreciated each other's help in some of their past battles. Willow, who is openly gay and has a history with women who have power, might have a soft spot for one of the sisters, which could add an interesting twist to a potential encounter between them.