Main characters ; : :Ryoma lived an uneventful life as an office worker/salaryman in Japan before dying in his sleep. Due to his diligent and kind behavior, Ryoma earns the grace of three gods from Seilfall who bring him to their world as an 8-year-old boy where he lives in a forest for three years while polishing his skills and taming hundreds of slimes, making use of their multiple abilities in various tasks from combat and hunting to cleaning and crafting, until meeting the Jamil family who warmly welcomes him among them. Determined to live independently, he refuses to overindulge on their hospitality and looks for ways to make ends meet by himself. It was later revealed that Ryoma's harsh life on Earth was caused by the God of Earth who intended to torment him enough for him to turn into a murderer, just for his amusement. Seeing that he failed to break Ryoma's mind, the god gave up on him and provoked his death instead. ; : :Heir to the Jamil dukedom, Eliaria is an 11-year-old girl who becomes Ryoma's closest friend. Like Ryoma, she is a monster tamer and her body is gifted with large magic potential, but she has difficulty controlling it until Ryoma teaches her how to train herself properly. After Ryoma decides to stay in Gimul, she frequently exchanges letters with him. Eliaria later moves to the Imperial Academy at the capital for her studies and makes some new friends.
Jamil Household ; : :The Duke of Jamil and Eliaria's father, he meets Ryoma in the forest and becomes his friend, later inviting him to live with his family. ; : :Duchess of Jamil and Reinhart's wife. Upon meeting Ryoma, she quickly grows attached to him, treating the boy like her own son. ; : :The former Duke of Jamil, he is Reinhart's father and a well known monster tamer. He also is one of Ryoma's closest confidants to whom he entrusts the secret that he is a Child of God. ; : :One of the Jamil family's bodyguards, he gets injured while fighting a bear and rescued by Ryoma, leading his first encounter with Reinhart. He later becomes Lulunese's husband. ; :A female cat beastkin who is a maid of the Jamil Household. She later becomes Hughes' wife.
Deities ; : :The goddess of healing and love with the appearance of beautiful young woman. When she visited Earth, she spent her time eating whatever she wanted. ; : :The god of life with the appearance of a young boy. When he visited Earth, he spent his time traveling all over the world, even the depths of
Atlantis and
Sahara Desert. ; : :The god of creation with the appearance of an elderly man. When he visited Earth, he spent his time listening to idol groups. ; : :The god of wine and craftsmanship with the appearance of a plump adult man. He takes in interest on Ryoma after witnessing his stone sculptures and also becomes his friend. ; : :The god of magic and academics with the appearance of a young bespectacled man who asks Ryoma some questions to confirm that he is not at risk of misusing his powers. He tends to speak impersonal sentences, lacking much emotion. ; :The god of fishing and ports with the appearance of an androgynous young boy. He takes an interest on Ryoma due to his ability to withstand the gods' powers to some extent and upon investigating his mind, discovers the truth about his harsh life and early death.
Bamboo Forest Laundry Shop ; : :A member of the Trading Guild who becomes a manager of Bamboo Forest under Ryoma's. She later moves to Lenaf to manage the laundry's second shop. ; : :Carla's twin brother who was also lent by the Trading Guild to be a manager of Ryoma's shop. He often speaks up whenever Ryoma is pushing himself too far and needs rest. ; : :A bodyguard hired by Ryoma to protect his Gimul shop; due to ignorant Tamers being jealous of a business successfully run with slimes. He is typically stoic and doesn't speak. ;, : :Three slime researchers who were fired from the academy and become employees at the Lenaf shop. They are grateful to Ryoma for teaching them how slimes evolve, though they tend to call him in to handle the slime contracts when the slimes multiply too fast. ; : :Bamboo forest's cook at the Gimul shop. She was hired at the same time alongside Fina, Jane and Maria. ;, : :All three left their home village together in search of work before being hired by Ryoma at Bamboo Forest. They were surprised not only that Ryoma was a child who owned the business, but that he treated all employees equal regardless if they were local or not. More than anything, they highly appreciate him from providing a comfortable work environment and free lodging. ; : :Former assassins employed by Ryoma at Bamboo Forest within a day of the shop opening, due to the overwhelming
clientele. Ryoma pays them extra for bodyguard duty. Despite their past, they are quite affable and enjoy their new life. Ryoma often consults them over how to better protect the shop whenever a new issue arise. They fled their old country due to political drama.
Adventurer's Guild ; : :A female cat beastkin and rank B adventurer, she becomes Ryoma's first client after he becomes an adventurer when he is tasked to clean her house, later becoming his friend. ; : :The master of the Adventurer's Guild's Gimul branch. He has an embarrassing past event involving being filthy, which he wants kept quiet. ; : :A female wolf beastman and Miya's friend. ; : :A female tiger beastman and Miya's friend. ; : :A female rabbit beastman and Miya's friend. ; : :The receptionists at the Adventurer's Guild's Gimul branch.
Merchants Guild ; : :Guild master at the Merchants Guild.
Others ; : :Ryoma's co-worker during his previous life. Ryoma named the first slime he tamed in his honor, but the slime dies, leaving only its core. ; : :A young female fox beastkin and Pioro Saionji's daughter, she trains to be a merchant like her father and befriends Ryoma during his stay in the city of Lenaf. She later moves to the capital to study at the Imperial Academy, becoming one of Eliaria's close friends. ; : :Miyabi's father who is a merchant and a descendant of a Child of God, having maintained within his family many aspects and traditions of his ancestor, including his surname. ; : :A merchant who is friends with the Jamil Family and President of the Morgan Trading Company who helps Ryoma open his laundry shop, later becoming his business partner in other enterprises. ; : :The leader of the Semroid Troupe. ;, : :Three female students of the Imperial Academy from different upbringings who befriend Miyabi and Eliaria and become part of their study group. Unlike most groups who are solely commoners or nobles, their group is a mix because they respect each other and do not care about social status, which the academy teachers are proud of. ==Media==