Has dog ears. 4 years old.

Wears swirly glasses. Constantly chants "Riinu-kun Riinu-kun Riinu-kun Riinu-kun," which creeps people out a little. 4 years old.

Actually an 18-year-old high school student inside. Self-proclaimed 4-year-old.

One of the three devious brothers. 4 years old.

One of the three devious brothers. 4 years old.

One of the three devious brothers. Hails from Planet Popipapapapipo. 4 years old.

The principal of STPR Kindergarten. Always carries stomach medicine. "Honestly, nothing surprises me anymore." 27 years old.

A kindergartner who is good at cooking. Close friends with Melt-kun. 4 years old.

Often gets scolded for saying strange things. 22 years old.

Sometimes has a foul mouth. Kind-hearted. 25 years old.