Fairy Tail-Erza Scarlet

Erza Scarlet is an S-Class Mage of Fairy Tail and is more commonly known as Titania. She is also  one of the main female protagonists of the anime. She uses Requip Magic which allows her to change her equipments freely. Based on the storyline, a normal mage can only change their weapons during a fight but Erza could change both her armor and weapons almost instantaneously. She can even summon 100 weapons at a time!