Kid and Dr.Riddle
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Kid and Dr. Nazonazo are known as Kido and Dr. Riddles from the series Zatch Bell!.
Kido found Dr. Riddles all alone in a building reading books all day, Kido convinces the doctor, who had gone into hiding because he couldn't save his grandson from dying on the operating table, to team up with him and help him to become the mamodo king. Dr. Riddles likes to mess with Kido and jokes around with him all the time. Kido is happy when he and Dr. Riddles are friends. They are a good team. Kido's spellbook got burned in the fight against the Four Heavenly Kings in the fight against Zophis and the mamodo from a thousand years ago. Kido cares for Dr. Riddles as a friend and declares in the episode that his book is burned "Dr. Riddles is my King!"