Shiori Oumi

Oumi Shiori is the deuteragonist of the This Monster Wants to Eat Me series. She is a mermaid yōkai who has pledged to Yaotose Hinako that she will be the one to devour her. In her human form, Shiori appears as a teenage girl with very long, thick, dense deep-blue hair and eyes of the same color. Her true form is that of a tall mermaid, covered in teal scales, with a humanoid torso and a long, serpentine tail with a pair of small fins on each side of her hips. She has elongated arms and sharp claws at the end of her fingers. Large horns similar to ramose corals protrude from her head and eye ...

Shiori exhibits a nonchalant but snide and sometimes forceful demeanor.