"Hi! My name is Aion!" A yellow Winion that resembles a cat or a dog with perky ears. She has very sparkling eyes and a bright, cheerful personality. She was the first Winion to be born and is considered quite attractive among them, often hearing that she has a cute face. She seems to be aware of her own cuteness. Like Fix, she is very mischievous; she loves exploring inside trash cans, playing games inside folders, and stealing snacks that Bo stacks up in folders. However, because she is so active and loves to play, she lacks a bit of common sense and tends to dislike studying. As a side note, she always refers to herself in the first person by her name, "Aion." Also, she is left-handed. While all Winions are genderless, Aion leans toward the feminine side. She is the object of Grid's unrequited love, but she seems too oblivious to notice.

"This is really delicious, do you want some?" A pink Winion that resembles a bear, hippopotamus, or hamster. She is characterized by a chubbier build compared to other Winions and loves eating. She is said to stack plenty of food inside her folder. However, she has a kind and warm personality, willingly sharing her snacks with other Winions. She has a habit of drawing out the ends of her sentences. She was the second Winion to be born. She has the most easygoing and well-rounded personality among the Winions. With a gentle nature that contrasts with her large frame, she acts as a mediator when there are conflicts or incidents among friends. Surprisingly, she is "soft on the outside, tough on the inside." Regardless, she is expressive with her emotions and seems to be a mentally strong Winion with rich sensibilities. She is the only Winion without a tail. As a side note, she had a similar build to Aion when she was born, but she ate so much food that she became her current chubby self in just one night. While all Winions are genderless, Bo leans toward the feminine side.

"I'm studying, so please don't disturb me." A green Winion with horns on both sides of his head. His design is characterized by straight lines, seen in both his horns and the white patterns on his face. The whites of his eyes are yellow. He has a tendency to enjoy being alone, so he initially acted indifferent toward his friends, but he eventually developed feelings for Aion. He was the third Winion to be born. He even develops programs that speed up recovery for the clumsy Aion. It pains him that there is no medicine for Winions yet, and his dream is to develop medicine specifically for them. He is considered the smartest among the five Winions. He is very rational, calm, and mature—so much so that Fix asked him if he was on his second life as a Winion. He has shown this calm and composed attitude since the moment he was born. At first, he found the other Winions annoying, but as time passed, he began to show a more human side, treating his friends with some gentleness and kindness, and occasionally putting off his studies to play with Aion. While all Winions are genderless, Grid leans toward the masculine side.

"Can I become a useful Winion too?" A blue Winion that resembles a dog or a lop-eared rabbit. The white patterns on her face connect under her eyes like tear tracks, and the whites of her eyes are red to pink. She was the last Winion to be born, and because she was born differently from her expected date, she naturally shows slight symptoms of depression. She is close to Guest (Fix), who took care of her when she was a newborn, and considers him a good Winion. She feels she isn't good at anything and has very negative thoughts about herself. Sometimes she envies Guest (Fix), who is popular and good at everything. She is extremely introverted, to the point of being evaluated as a 'timid and sensitive Winion' right after birth. She is delicate, fearful, and naturally quiet, but rather than having little interest in others like Grid, she is more shy and timid. Still, she inwardly desires popularity and makes efforts to strike up conversations first to get along with friends. Surprisingly, she has a significant talent for programming—so much so that her skills are comparable to Grid's. As a side note, she is left-handed. While all Winions are genderless, Debug leans toward the feminine side.