Ttolbong-i

A 9-year-old boy. He is Ttolttori's older brother. He is a prankster who loves shooting water guns at Ttolttori's pets. He doesn't get along with Ttolttori. He also enjoys playing with his friends.

Mongsiri

Ttolttori's dog. He talks to Ttolttori, but only barks at other people. He is male. He loves playing ball or going places with Ttolttori. He is very cheerful.

Nyangi

Ttolttori's chic cat. She is realistic and only speaks when she is with Ttolttori; she just meows at others. She is female and often suggests solutions. She is a chic, cool, and haughty cat.

Aengdu

Ttolttori's bird. She can speak and mimic other people's voices. She can fly and is female. She has a bit of a tsundere vibe. She often perches on Ttolttori's head.

Ttolttori's Mom

Ttolttori's mother. She is the owner of an ice cream shop. She is a middle-aged woman who loves her family. She takes good care of Ttollang-i.

Ttolttori's Dad

Ttolttori's father. He is good at drawing. He is an ordinary office worker. He plays with Ttolttori using monster or hero masks. He loves his family.

Ttollang-i

A baby boy. He babbles and cries. He is cute. He is Ttolttori's younger brother and the youngest of the family. He loves Ttolttori. He can't sleep unless he's with his mom.

Tokkaengi

A rabbit from the moon. She is Ttolttori's rabbit. She is kind and pure. She is female and cute.

Ttolttori's Grandma

A veterinarian. She is Ttolttori's grandmother. Like Ttolttori, she can communicate with animals. She treats animals. She is a kind and friendly grandmother. Ttolttori sometimes visits the animal hospital, or Grandma comes to Ttolttori's house.