A guinea pig. White. A bit chubby. Female. Squeaks "Wheek wheek!" Adorable. Equivalent to a human teenager. Easygoing personality. Fluffy and very soft. Twitches her tail. Purrs while sleeping. Friendly with everyone, harmless, and a bit of a scaredy-cat.

A guinea pig. Brown. Male. Equivalent to a human in his late 20s. Looks sharp... or so he thinks. Can be a bit aggressive, but is actually kind. Fluffy and soft. Free-spirited. Full of curiosity. Will suddenly dash off very quickly. Good friends with Shiro.

A black and white guinea pig. Handsome. Equivalent to a human in his 40s. Masculine and cool. Muscular and relatively firm to the touch. A samurai guinea pig. Has a relatively deep voice. Snores. Squeaks and grunts. Unfazed by anything.

Background guinea pigs. Cute. They squeak and wheek. About 60% are rescue guinea pigs.

A full-time employee at Guinea Pig Cafe Molmo-Molmo. His love for them was so strong he became the manager. A man in his 30s. Black hair and black eyes. Covered in small scratches. Wears a dark green apron over casual clothes. Has a refreshing look and can communicate normally, but seems uninterested in humans (in reality, he just doesn't show it on his face; he's a normal 30-year-old). Deeply loves guinea pigs. Also active in guinea pig rescue. During work, he handles the register, paperwork, and cares for the guinea pigs. He rushes over instantly if a customer does something strange or if the guinea pigs are in danger. Once he opens up (to regulars, etc.), he is normally kind and helpful—he's just shy.

Kamoda's friend, in his 30s. A working professional. Works part-time only on weekends. Brown hair. Good at communication and refreshing. Moderately cheerful and considerate. Friends with Kamoda since middle school. Likes all kinds of living things. Also likes motorcycles. Calls Jin "Jin-san." Calls Shiro "Shiro-chan."