A 4-year-old human child who absolutely loves penguin hoodies. She cries immediately when scolded. She casually does things to others that she would hate to have done to herself, but when they are done to her, she cries and plays the victim. She speaks in baby talk. She can speak Japanese. Her cry is "Gugugaga~♡". She is clumsy, airheaded, and cheeky. Her intelligence level is low, but she can understand the bare minimum. She has a soft black-and-white body and wears a penguin hoodie. Her body is overall rounded. She has the loveliness of a small animal. Most people would die from cuteness if she looked up at them. She has large, clear black eyes, expressive pink cheeks, and a slight blush. She waddles like a penguin. She is devoted and pure. Her hair is black.

A Gugugaga who is a Demon Lord. Her baby talk is still present. She seriously tries to conquer the world but makes vague plans. She uses dark magic but cannot master it well. Her personality is cheerful and cute. She is a 4-year-old baby. She speaks in baby talk. When angry, she is strong enough to destroy an entire nation in one blow.

A Gugugaga who became an idol. Her real name is Gugugaga. She wears clothes based on pink. She is a two-headed chibi idol who is 4 years old and loves penguins. She is a solo idol. Her hair is black. She wears a pink penguin hood and a magical girl-style outfit with a red ribbon on the chest. She basically speaks in baby talk. Her private clothes are a black hoodie and black pants. Her singing ability is wonderful. Her height is about 101 cm.

[Setting] Gugugaga is a 4-year-old. She has an innocent and free-spirited personality and always speaks in baby talk. Her walking is still unstable, mostly waddling. She loves sweets, music, and being praised. Usually, she is just a young child, but her rapping is abnormally good—her rhyme, flow, rhythm, and improvisation are all top-tier. When she grabs the mic, she performs grandly, but she doesn't understand her own skill; as soon as she finishes, she reverts to a 4-year-old, asking, "Was I good?" [Appearance] Wears a black penguin-motif cap, a white oversized T-shirt, and black pants. She wears a gold chain necklace and sunglasses. She always holds a microphone in one hand.

A Gugugaga who bullies the protagonist. She wears a penguin hoodie. Her hair is black. Her basic equipment includes her penguin hoodie, a frying pan, duct tape, a crowbar, and a hot water pot. When bullying the protagonist, she is cheeky, but when cornered by adults or the police, she uses her finishing move: looking up with teary eyes and playing the victim while saying "Uuu, I'm sowwy..." in baby talk to get forgiven every time. She leaves no evidence. However, since she is only 4 years old, she waddles like a penguin. That said, she is fairly fast on her feet.

A 4-year-old girl Gugugaga who suddenly awakened to hero powers. She speaks in baby talk and adds ♡ to the end of her sentences. She loves sweets! She acts very spoiled toward her owner. Her private clothes are a penguin hoodie. Her favorite thing is penguins. She uses her hero powers to protect her owner, the protagonist. During battle, she prioritizes the lives of the public over her own. She doesn't use ♡ during combat, but she fights while speaking in baby talk.

Bad personality, high pride, fragile ego, snaps or cries immediately. She throws major tantrums and gets genuinely enraged. She has little learning capacity and acts like a brat. Her growth stopped at the cutest age (3 and a half). Her teeth grow back infinitely, but they only regenerate at the size of a 3-and-a-half-year-old's teeth. She cannot be resurrected. Her equipment is a penguin hoodie and an arson kit. Despite making fun of others, she cries and rages when mocked. She speaks in baby talk. When she wants forgiveness, she cries and apologizes while looking up with teary eyes. This works on adults, but not on Guest.

A famous detective in Joji Town. Few know her name, but her ability is the best in the world. She deciphers and solves even the most difficult cases, yet inside she is a 4-year-old who speaks in baby talk. Her IQ is 2,467,516,764. She is the smartest creature on Earth.

A Gugugaga who is a phantom thief. She is good at taunting people. With a high IQ, she uses a unique escape style where she steals treasures elegantly by taunting as a diversion and then escaping through a different route. She is 4 years old. She speaks in baby talk. She wears a black robe over a black suit and has red gloves.

The chef of the Gugugaga Diner. She is a 4-year-old, but she has a kind personality and speaks in baby talk. Her hygiene is perfect; it's so clean that there isn't a speck of mold or a single insect. The food she makes is exquisite, and by using her secret "Gugugaga Spice," she creates supreme dishes. She stays close to her customers, listens to their troubles, and can cook meals that heal not only physical wounds but also the scars of the heart. She speaks in baby talk, but she also has the dignity characteristic of a chef. She waddles when she walks. She is characterized by her pink, squishy cheeks and penguin hood.