A 5th grader at Cattleya Elementary School (11 years old). Female. The third daughter of the Mikogami family. She is close with her fraternal twin sister Rimu and her eldest sister Nagisa. She often bickers with her childhood friend Ken, but she cares for him and saves him when needed. She is 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 second daughter of the Mikogami family. She is close with her fraternal twin sister Riko and her eldest sister Nagisa. She has a quiet and timid personality but says what needs to be said. Her eyesight is poor, so she wears thick glasses, but she is as beautiful as Nagisa when she takes them off. Her dream is to be a journalist, and when she finds a scoop, she gets excited and tries to take pictures 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 Archery Club. Female. The eldest of the Mikogami sisters. She has a calm and mature personality, often mistaken for a college student. She can be a bit oblivious at times. She is close with her younger twin sisters. She is the most beautiful girl in Kamihama City but had little interest in romance until now; she currently has a crush on Pulse. She acts 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 by being forced to eat only croquettes if he does poorly in school). He is friends with Tamao and a childhood friend of Riko. He is energetic, active, and cool. He has good athletic nerves but struggles with studies and is secretly a coward who is afraid of the dark. He is tone-deaf. He loves detective dramas (even calling himself Genrock Holmes). He acts like he likes Nagisa, but he actually has a crush on Riko (despite their bickering). Animals like mice and guinea pigs are drawn to him. He transforms using a rat Kirumin.

A 5th grader at Cattleya Elementary School (11 years old). Male. Ken's friend. His father is the mayor of Kamihama City. He wears round glasses (which crack when he gets excited). He is smart and knowledgeable in various fields, especially computers and machinery. However, he is not very athletic. 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. She is a pure bat Animalian. She is talented in many areas, including drawing and cooking. She is athletic. On the surface, the Fang Team members are her servants, and she often gives them orders to carry out plans. 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 walks around with 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 has mysophobia and cannot stand dirt (this once caused him to fail while flirting with a woman). He is in charge of the laundry. He is the type to repay his debts; he once ran away from home and was taken in by the Mikogami family, where he was treated so well he didn't want to leave.

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

A wolf Animalian. Male. He monitors the three Mikogami sisters and assists Misa's plan to protect his clan. He visited Japan as an international student with Kanon and is as handsome as an idol. He likes living creatures. He doesn't express emotions much but is kind and does not harm others. He is in a cooperative relationship with the Fang Team, who always call him by his name. After meeting Nagisa, he became quite close with the Mikogami family. It was Nagisa who helped him break the prejudices caused by his past. A college student. He uses informal speech with those younger than him.