Madame Ixchel

"'Gesundheit.'""— Jordan Pilkenton, after hearing Madame Ixchel's name."Madame Ixchel is a sorcerer witch from New World Magischola who lives in New York City. She was first mentioned by name in Chapter 1 of  Case 0: New Years, New Fears, but didn't actually appear until Chapter 2. She owns a vast knowledge of magic and has written several books on the subject.

Chapter 1: Best Friend Wanted
At some point in her lifetime, Madame Ixchel wrote Demons and the Art of the Deal, a book covering several bits of information regarding Demons. Garrett Buss uses the information he had read to summon the demon Jordan Pilkenton so that they could become best friends.

Chapter 2: Who Let the Hybrid Animals Out?
While trying to avoid contact with a mysterious hooded cult, Garrett and Jordan visit Madame Leveaux in hopes she can assist them. They go to her apartment, Madame Leveaux's Mystic Shoppe of Sorcery and Magicks, where she reveals herself to be more than just some fraudulent magician. She notifies them that she is a true witch who's real name is Madame Ixchel. She informs them that they had just let loose several Hybrid Animals across New York City, of which include Pongo the Dalmatian and 'the monster'. It is up to the duo to round up the creatures before they garner too much attention from the Cursebreakers, an organization of magical police.