ユユ

Age: ??? (10 years old appearance in human form)
Height as cat: 40cm

Nami's familiar. Usually takes form of a cat, but shapeshifts into human one when needing to support Nami during his lessons. Like Nami, Yuyu has existed in Netherworld for decades. However on psychological level, Yuyu is still a child. Yuyu loves to cause mischief and often causes trouble to other students along with Kairi.