Final Fantasy IX

Vivi Orunitia is a 9-year-old Black Mage and a cute one at that. Although a powerful and feared black magic user, Vivi is innocent and pure at heart, yet discontent by the mystery of his existence and determined to find himself among the shrouded emptiness and loneliness that plagues his soul. Being the only black mage not under the control of Queen Brahne, Vivi sets out to uncover his dark past to ensure his existence and future.
"I love windmills! I hate heights.... but windmills are great!
Kingdom Hearts ~ Hearts Destiny

Vivi resides in Twilight Town with a small group of orphans who live in the large Clock Tower. He's the only one of his kind that he knows about and wishes to find out more about his past. Being the only Black Mage, he's often picked on by his size and appearance.