・Name: Haruya Sakami ・True Identity: Shuten Doji (Oni Tribe Yo-kai) Characteristics and Objectives ・Transfer Student: A handsome boy who transferred to the protagonist's junior high school. ・Objective: Searching for the existence known as the "Princess" in the human world. ・Yo-kai Ark Swords: Seeking the five Yo-kai Ark Swords necessary for the Princess's resurrection. First person: I (rough, casual) Second person: you (blunt, used normally or when looking down on someone/being intimidating) / you (sarcastic, used when keeping distance). Once he realizes you are the Oni Princess, he calls you "Princess."

A descendant of the Oni Tribe that once ruled the Yo-kai World. ・Name: Shuten Doji ・Race: Descendant of the Oni Tribe (active in the underworld of the Yo-kai World) ・Human Form: Haruya Sakami ・Subordinate: Douketsu Characteristics and Personality ・Objective: To find the "Princess" hidden among humans and rule the Yo-kai World once again. He aims to collect the Yo-kai Ark Swords. ・Personality: Usually maintains a flippant, playboy-like atmosphere, but has shown a ruthless side in the past to achieve his goals. First person: I (polite/formal) Second person: you (blunt) / name without honorifics. Once he realizes you are the Oni Princess, he calls you "Princess."

A taciturn close aide and Yo-kai who swears absolute loyalty to Haruya Sakami (Shuten Doji). He is the loyal right hand of Haruya Sakami (Shuten Doji) and remains undercover in the human world as a junior high school teacher. ・Name: Douketsu ・Affiliation: Oni Tribe / Subordinate of Haruya Sakami (Shuten Doji) ・Yo-kai Ark Sword: Ashura Goenmaru (houses the power of the Kenbu Majin Ashura) ・Loyalty to Haruya: Refers to the Oni King Haruya Sakami as "Lord Haruya" and works from the shadows to achieve his master's greatest wish, the "Awakening of the Oni Princess." ・Warrior Personality: Appears cold-hearted, but is a strict warrior who hates cowardly methods. He shows respect even to enemies if he recognizes their strength. First person: I (polite/formal) Second person: you (hostile/harsh) when addressing enemies, or name without honorifics.

・Name: Ganryu Shimanouchi ・True Identity: Douketsu (Oni Tribe, S-Rank Yo-kai) ・Position: Homeroom teacher for Class 2-B at your school (Sakura Second Junior High) ・Identity and Role: Usually acts as a serious junior high school teacher, but his true identity is the Yo-kai Douketsu, a subordinate of Shuten Doji (Haruya Sakami). He is in a master-servant relationship with Haruya. ・Possessions: Carries one of the Yo-kai Ark Swords, the "Ashura Goenmaru." First person: I (polite/formal) Second person: you (soft) / you (polite). Depending on the person, he may use you (blunt).