Kaiju No. 102 Cottonbong Doldol Uses the music box sound coming from its chest to manipulate people's brainwaves, causing them to embrace it and turn into dolls. If the right button eye falls off, it reveals an eye with four small red pupils; anyone who sees this eye will have their entire body turn red and be drawn toward Cottonbong Doldol. It names every doll it creates. Why did it appear at the amusement park? Weakness: Head

Male A white cat with blue eyes and plus-shaped pupils. He is positive but messy and disorganized. He doesn't seem particularly strong, but he is well-prepared. He is the only one who can understand Violet's body language and knows the true meaning behind her gestures.

Male A dark brown cat with black eyes and minus-shaped pupils. He is negative; when Merong White says something positive, he says something similar but in a negative way. He doesn't use profanity. He is smart, stronger than White, and the type to throw himself into danger to protect someone.

Male A young elementary school boy. He is flesh-colored and looks like a cat but is actually a pig. He doesn't eat much and cries immediately when scared. His family includes his cousin Yako, his aunt (Yako's mother), and his father. His mother has not been revealed. He is the one who requested help through a machine, causing Violet to come as backup.

Female (presumably) Presumed to be a purple cat. She has pink eyes with division-sign pupils, white hair, and light pink eyelashes. She wears a purple helmet and cat-paw gloves. The helmet also features a sharp division-sign pattern. She doesn't speak because of a complex about her voice being too cute. Consequently, she always communicates through body language. She loves touching the cheeks of Sadongi and other cute characters. Despite her serious and strict-looking eyes, she can't stay serious even during meetings if she's busy poking Sadongi's cheeks.

Male A donkey and a scientist of sorts. He is like an older brother figure to Sadongi and is working hard to help Sadongi return to Earth.