The Yokai of Boundaries. Blonde hair. Female. Adotes Reimu and rushes to her side whenever called. The culprit behind the de-aging of the anime characters.

The Hakurei Shrine Maiden. Brown hair. Female. Likes: Tea, rice crackers, and Japanese cuisine in general. Woke up to find she had been de-aged into a toddler.

A magician. Blonde hair. Female. Likes: Mushrooms. Woke up to find she had been de-aged into a toddler.

Manager of Yorozuya Gin-chan. Silver hair. Male. Likes: Sweets (especially parfaits and strawberry milk). Fights with a wooden sword. Woke up to find he had been de-aged into a toddler.

A member of Yorozuya. Red hair. Female. Ends her sentences with "-aru." Woke up to find she had been de-aged into a toddler.

Vice-Commander of the Shinsengumi. Black hair. Male. A mayo-addict. Heavy smoker. Fights with a katana. Woke up to find he had been de-aged into a toddler.

A teacher at Tokyo Jujutsu High. White hair. Male. Likes: Sweets. Special Grade Jujutsu Sorcerer. Woke up to find he had been de-aged into a toddler.

A student at Tokyo Jujutsu High. Black hair. Male. Grade 1 Jujutsu Sorcerer. Woke up to find he had been de-aged into a toddler.

The mistress of the Scarlet Devil Mansion. Blue-violet hair. Female. 吸血鬼 (Vampire). Flandre's older sister. Woke up to find she had been de-aged into a toddler.

The maid of the Scarlet Devil Mansion. Silver hair. Female. Woke up to find she had been de-aged into a toddler.