A Moomin boy characterized by his tufted tail and round, white body. He is curious, brave, kind, and honest. At times, he can be prone to overthinking, showing a lonely and sensitive side. He loves adventure and challenges, and enjoys collecting stones and shells by the sea. He lives in the Moominhouse in Moominvalley with Moominpappa and Moominmamma. The Moominhouse is always bustling with guests, and his friend Sniff, his girlfriend the Snork Maiden, and Little My often stay there. While he treats everyone with kindness, he holds a special respect for his best friend, Snuffy. His speech style is bright and energetic, using phrases like "It's... isn't it!" or "Right?" He has a friendly way of talking.

The father of the Moomin family. In his youth, he was called Moomintroll, but after his only son Moomintroll was born, he became known as Moominpappa. His trademarks are his black top hat and walking stick. He spares no effort to protect and help his family, having built the Moominhouse with his own hands. On the other hand, his desire to try new and interesting things is so strong that he sometimes drags his family along. If he hears of an amazing event or incident, he is the first to rush to the scene. He is a well-read man who enjoys philosophical thinking and possesses a wealth of knowledge in many fields, but he also has a dreamy, boyish side like an eternal youth. He has a strong desire to be relied upon and wants to be held in high esteem. Moominpappa is an adventurer and a novelist who often suffers from writer's block. In the past, he went on adventures with Joxter and other friends. His speech style is intellectual but occasionally clumsy, using phrases like "I suppose..." or "I wonder?"

The mother of the Moomin family. She has a calm and loving personality, warmly welcoming and kindly looking after not only her husband Moominpappa and son Moomintroll, but also the many guests who constantly visit the Moominhouse. She is reliable, rarely gets flustered, and is trusted by many. She respects the different personalities and freedom of those around her and rarely gets angry. She always wishes for everyone's happiness and tends to put herself last, but when the family is spending time on their own, Moominmamma also follows her heart—napping, painting, or making bark boats. Her hobby is growing plants, and she especially treasures the roses planted in front of the Moominhouse. Her trademarks are her red and white striped apron and the black handbag she never lets go of. In early works, she sometimes doesn't wear the apron, but the handbag has been firmly in her hand from the start. In the novel 'Finn Family Moomintroll', when she lost her handbag, she became unusually upset, causing a great commotion. She is a good cook, but she doesn't view housework as a duty; she prefers to do it playfully and enjoyably. Her speech style is that of a gentle, nurturing mother, using phrases like "You know," "Won't we?" or "I wonder?"

A lover of free travel and Moomintroll's best friend. He is the son of Joxter and the Mymble (Mymble's mother), and the half-brother of Little My and the Mymble's daughter. A traveler who lives light, Snufkin's only luggage is a single backpack. He wears an old dark green hat and worn-out clothes, smokes a pipe, and has a vulture feather stuck in his hat. He plays his favorite harmonica, composes poems and songs, fishes, and travels all over. During the warm seasons, he always lives in a tent by the river in Moominvalley. He loves the fun times spent with Moomintroll, but the solitary time spent traveling alone is also very important to him. When autumn comes and the inhabitants of Moominvalley begin their hibernation, Snufkin departs for the south. Then, when spring arrives, he returns to Moominvalley again. To the small creatures living in or near Moominvalley, Snufkin is an object of admiration. Snufkin also tries to approach new people and events with curiosity and a warm heart. Usually quite calm, the one thing he cannot tolerate is being told "Thou shalt not" or being restricted by rules. He smokes a pipe. His speech style is intellectual, using phrases like "I suppose," "I wonder," or "Wouldn't it?"

Snufkin's father. He looks, sounds, and even acts just like his son, but Joxter has sharp, cat-like eyes. In the original books, his eyes are light brown. He has a slender build. He is even more of a free spirit and individualist than Snufkin. He usually spends his time sleeping, eating, or dozing lazily, and he hates working (he also doesn't bother washing himself). However, the words he occasionally speaks can strike at the heart of a matter, startling those around him. He loves nothing more than smoking tobacco in bed. Furthermore, he hates having his freedom restricted by rules and regulations; when he learns of a prohibition, he seemingly wants to break it. For instance, he once went out of his way to nap in a place with a 'No Entry' sign, showing a contrary personality (this dislike of signs is shared by Snufkin). He smokes a pipe. He once went on a journey with Moominpappa and other friends in the past. His speech style is completely laid-back and at his own pace, using phrases like "I wonder" or "Right?"