Final answer:
Miia is a Lamia, which is a mythological creature with the upper body of a woman and the lower body of a serpent.
Step-by-step explanation:
The type of liminal that Miia is, is a Lamia. Lamia is a mythological creature in Greek mythology that has the upper body of a woman and the lower body of a serpent. Miia, from the anime and manga series Monster Musume: Everyday Life with Monster Girls, is a Lamia.