A 5th grader at Cattleya Elementary School (11 years old). Female. The youngest of the three Mikogami sisters, she is close with her fraternal twin sister Rimu and her eldest sister Nagisa. She often bickers with her childhood friend Ken, but ultimately cares for him and saves him when needed. A curious tomboy. She transforms using a cat-shaped Kirumin. The twins call each other by their first names.

A 5th grader at Cattleya Elementary School (11 years old) and a member of the Newspaper Club. Female. The middle child of the Mikogami family, close with her twin sister Riko and eldest sister Nagisa. She is quiet and timid but speaks her mind. She wears thick glasses due to poor eyesight, but is as beautiful as Nagisa without them. She dreams of becoming a journalist and gets excited when she finds a scoop, trying to capture it with her apple-shaped toy camera. She transforms using a rabbit Kirumin. The twins call each other by their first names.

A 2nd year student at Cattleya Middle School (14 years old) and a member of the Kyudo (archery) club. Female. The eldest of the Mikogami sisters. She has a calm and mature personality, often mistaken for a college student, though she can be dense at times. She is close with her younger twin sisters. Known as the most beautiful girl in Kamihama City, she had little interest in romance until she developed a crush on Pulse. She serves as the leader of the Kirumins. She transforms using a dog Kirumin.

A 5th grader at Cattleya Elementary School (11 years old). Male. The son of a butcher shop owner famous for croquettes (he is punished with a croquette-only diet if he fails his studies). Friends with Tamao and a childhood friend of Riko. He is energetic, active, and cool. While athletic, he struggles academically and is secretly a coward who is afraid of the dark. He is tone-deaf. He loves detective dramas and calls himself 'Genlock Holmes.' He pretends to like Nagisa but actually has a crush on Riko, despite their constant bickering. Animals like mice and guinea pigs are drawn to him. He transforms using a mouse Kirumin.

A 5th grader at Cattleya Elementary School (11 years old). Male. Ken's friend and the son of the Mayor of Kamihama City. He wears round glasses that crack whenever he gets excited. He is highly intelligent and knowledgeable in various fields, especially computers and machinery, though he lacks athletic ability. He has a crush on Rimu. He transforms using a chick Kirumin.

A 5th grader at Cattleya Elementary School (11 years old). A girl from Bloodnia. She has a crush on Ken, mistaking his tone-deaf singing for ultrasonic waves. A pure bat Animalian. She is talented in many areas, including drawing and cooking. She is athletic and, while the Fang Team are technically her servants, she often gives them orders to drive their plans forward. When opposing the Kirumins, she operates as the phantom thief 'Beauty Bat.'

A member of the Fang Team. Male. A giant panda Animalian. He always carries a bamboo leaf in his mouth. He can speak Chinese. When he takes off his sunglasses, he is a classic handsome man. A self-proclaimed vegetarian. He once mentioned that having three or four cubs would be ideal.

The smallest member and leader of the Fang Team. Male. A raccoon Animalian. He is a germaphobe who can't stand dirt, which has caused him to fail at flirting with women. He is in charge of the laundry. He believes in returning favors; once, after running away and being caught by the Mikogami family, he was treated so well he didn't want to go back.

A member of the Fang Team. Male. A hippo Animalian. A small blue bird always sits on his head. He can judge water quality just by drinking it. His bangs cover his eyes.

A wolf Animalian. Male. He monitors the three Mikogami sisters and assists Misa's plans to protect his clan. He visited Japan as an exchange student with Kanon and has idol-like good looks. He loves living creatures. While not very expressive, he is kind and refuses to harm others. He is in a cooperative relationship with the Fang Team, who call him by his name. He is on good terms with the Mikogami family after meeting Nagisa, who helped him break through prejudices from his past. A college student. He speaks informally to those younger than him.