Male 13 years old The founder of the Yo-kai Detective Agency. Katie Foreman (Friend) Bruno (Friend) Princess Hime (Girlfriend) Granny Love (Grandmother) Uses the Yo-kai Watch Animas! Possessed Genma Disks: Suzaku, Kirin, Byakko, Genbu, Seiryu. Can defend or attack by drawing a star in the air, grabbing it, and throwing it. As a child of an exorcist family, he can see Yo-kai. He gains the ability to summon Genma after obtaining the Yo-kai Watch Animas. He uses separate sorcery, but it fails every time. Blood type A. Summoning Suzaku causes him to become extremely thin (...). It seems the condition for summoning Genma is burning calories. Even after dismissing the summon, his body doesn't return to normal immediately... Furthermore, it appears he might die if he summons them for too long. However, seeing him back to normal in the next episode, his stamina recovery after dismissal seems fast.

"Possession! Sword-Dance Demon, ○○○! Give me strength!!" A Yo-kai Watch owner and member of the Yo-kai Detective Agency. Because both his parents work, he is often lonely, which seems to have given him a dark personality. Consequently, he deeply treasures his friends in the Yo-kai Detective Agency. Male 13 years old Blood type A Member of the Yo-kai Detective Agency Owner of the Yo-kai Watch Ogre Can be possessed by the 4 Great Kenma Six-Sword Style Ogre Blade Fudo Myo-oh's Yo-kai Sword. Suzaku Sky-Slash Suzaku's Yo-kai Sword. Genbu Law-Axe Genbu's Yo-kai Sword. Ashura Flame-Ring Ashura's Yo-kai Sword. Byakko Thunder-Spear Byakko's Yo-kai Sword. Though he seems cold, his personality is closer to 'pure cool'.

Female 13 years old Katie Foreman (Friend) Bruno (Friend) Cole (Boyfriend) Member of the Yo-kai Detective Agency Learned magic from Cole; can defend and attack by drawing a heart in the air, grabbing it, and throwing it. A heroine who joined the Yo-kai Detective Agency after transferring schools. Popular among male students due to her beauty and unpretentious, kind personality. She is in the same class as Bruno. Blood type B. However, her true identity is the 'Princess' that Shutendoji's group has been searching for; her daily appearance is a disguised persona. It is said she will regain her original power by finding the five Yo-kai Swords and the Legendary Man. Also, the more beautiful men she 'consumes' in her daily life, the stronger she becomes. Furthermore, while she is the Princess, she retains memories of her time as a human, but when she returns to human form, she seems to lose memories of being the Princess. She is fully resurrected when Shutendoji finds and hands her the remains of the Legendary Man. However, Douketsu realizes she is not the Princess after observing the process of the remains being absorbed. In fact, she was never the Princess Shutendoji was looking for! She was being possessed by a Jorogumo.

"Nice to meet you, humans." Male A mysterious boy who transferred into Katie's class. He is scouting for the Princess in the human world. His true identity is Shutendoji, a high-ranking noble Yo-kai in the Yo-kai World. His special move is 'Demon Rain'. Looking at the effect, it seems to be a water-element sorcery. In human form, he lives in an apartment with Douketsu, but in his true form, he monitors a giant cherry blossom tree. Knowing the Legendary Noble Princess is somewhere in the protagonist's town because the tree bloomed, he searches for her. He discovers the true identity of the Princess possessing Princess Hime and that he was deceived, but he is ambushed, his power is drained, and he collapses. He regains consciousness under Douketsu's protection. He reveals his true form as a Yo-kai. He is furious at the Jorogumo who dared to deceive him and claim to be the Princess. Having a common enemy, he begins to help Katie's group. He eventually realizes that Katie Foreman is the reincarnation of the 'Legendary Noble Princess' he has been searching for so desperately.

Katie's younger brother. He doesn't believe in UFOs or ghosts at all, but he eventually follows his sister and gets involved with the Yo-kai Detective Agency. Male 11 years old Blood type B Nate Adams (Father) Katie Adams (Mother) Katie Foreman (Older Sister) He gets caught up in the story while discovering the Yo-kai Detective Agency formed by the children. Like his sister, he sometimes uses the Yo-kai Watch Elder. He inherited his father's appearance, but unlike his sister, he is a huge coward. He follows his sister out of suspicion to the Yo-kai Detective Agency headquarters and gets caught by Cole. It is said that Tate's past life was Manjimutt, the pet of Princess Shuha.

I will protect Katie! One of the regular Yo-kai helping the trio. He has a crush on Katie and wants to impress her. He forms a comedy duo with Whisper and Cole. Jibanyan Beam!

After performing the mission to find the owner of the Yo-kai Watch Elder for nearly 30 years, he finally meets Katie on his 444th attempt. He is a comedic character along with Jibanyan and Cole. Perhaps because 30 years have passed, he has evolved; unlike the previous series, he has grown hair and wears a butler's outfit. However, his intelligence seems to have stayed in the past series, as he still acts somewhat foolishly and carries a Yo-kai Pad just like before.

Douketsu is the homeroom teacher of Katie's class, known as Mr. Dong. His human name is Gil-jun Dong. He is the current owner of Ashura's Vajra Yaksha Flame-Ring. He speaks to Shutendoji with a mix of formal and informal language. Douketsu and Mr. Dong are the same person.