Grisor and Dr. Hakase are a mamodo-partner team who fought against Zatch, Kiyo, Shion, and Nya in the filler Magic Mirror arc of the Zatch Bell! anime. However, their spells are weak and based on Fire, but by adding the Mirror power, his spells get a hundred times stronger, like his weakest spell: Faigar. They, Nya and Shion Hibiki and Cut N' Paste and Kiichiro are characters who only appear in the anime.
Grisor was a mamodo trying to get the mamodo mirror. he was a small, blue, goblin like mamodo. He hired Cut n' Paste to help find the mirror pieces but he was defeated by Zatch and Kiyo. Grisor told Shion and Nya into helping him get the mirror pieces by telling them it would remove them from the contest for king, allowing them to stay together. When Zatch, Kiyo, Shion, and Nya brought their two mirror pieces to combine with his, he distracted them and ran away with the mirror. They caught up to him, but Dr. Hakase used a spell remotely by speaking it into a radio, with which Grisor targeted a radio like invention of the doctor's to create a smoke screen.
Dr. Hakase revealed that the mirror was taken by Grisor to the human world, and that it true purpose here was to help Grisor become king. Hakase used it to reflect one of Grisor's spells, transforming Grisor into a large, purple, ogre like monster. His previously insignifigant spells were now made 100 times stronger by the mirror. Nya attempted to fight him, but he burned her book with his new power. As Shion and Nya shared a tearful goodbye, Zatch and Kiyo promised to defeat him. Grisor showed off his immense strength, easily withstanding and overpowering his enemies' attacks. Shion attacked Hakase, knocking the mirror from his hand, which he quickly recovered. Grisor uses his most powerful spell, transforming into an enormous fiery demon, and fought against Zatch's Bao Zakeruga. Hakase discovers that Shion cracked the mirror, weakening Grisor. With its final bit of power, Zatch's spell defeats Grisor.
Dr. Hakase was Grisor's spellbook owner. Hakase was a famous scientist, having written many books, but was kicked out of some sort of organization by his colleagues, vowing revenge. Hakase met Grisor, and although their power was weak, he made machines to strengthen the spells to an extent. Hakase, some time after meeting Grisor, implanted metal onto parts of his face, possibly because of injury from mamodo battles. Hakase set up a hidden lab within his new apartment, including a camera set up all over the city.
In the original Japanese series, Dr. Hakase's name was Ichirou Hakase, which means Dr. Ichirou in Japanese (Hakase meaning "Doctor"). Due to an error in translation, his name was translated as Dr. Hakase, basically, Dr. Doctor.