Leon

Leon is Dian's Human Partner and the oldest candidate of the Jewel Star Grand Prix. A guy who has high awareness on magic, he's an expert magician and swordsman, who can use both magic and his swordsmanship. He can also turn his pen into a sword by using magic and uses it in any battles he encounters. His wish when he obtains the Jewel Star is to rule Jewel Land and improve the relation between humans and Jewelpets on both worlds. He and Dian can cast magic using the Jewel Charm as well. But it's unknown if he has a magical costume.

(source: Wikipedia)