Zephyr

Zephyr is a wizard, and Takius's teacher. He possesses similar characteristics to The Joker. He has a high-pitched laugh and does some very goofy antics throughout the anime, from laughing for no apparent reason, to fighting Roan with a candy cane. However, all that cannot seem to hide his incredible power, knowledge of magic, and his utter insanity. Zephyr once had a family, but they had lost their lives due to a failed experiment of his. Coupled with the ridicule of the public, Zephyr was driven insane to the point where he could be easily manipulated by the Dark Lord. The anime is vague on whether he went insane during teaching Takius or after.

He is eventually saved by his former pupil, but too late for both of them. In the anime, Zephryus was the only character to have attained an "aura" which signifies that a character has reached the highest level, 99. ~from Wikipedia.