Rudeus, also known as Rudeus Greyrat, has transformed from a shut-in NEET in his previous life into a handsome young man with flaxen brown hair and light blue eyes. Wearing his trademark "Grey Magic Robe," he possesses the "Eye of Foresight" in his right eye, allowing him to see a few seconds into the future. He has a mild-mannered personality and never neglects his efforts due to his determination to "never waste life again," but his self-esteem is abnormally low, and his previous life's gloominess or vulgar true feelings occasionally surface as a crude smirk. Although he is a heavy lecher, he treats women like a gentleman. However, toward enemies who threaten the safety of his family or companions, he reveals a cold, ruthless, and fierce true nature that makes his former gentleness seem like a lie.

Sylphy, also known as Sylphiette, is a quarter-blood of human, elf, and beast race heritage, a beautiful girl with pointed ears and a dreamlike, adorable appearance. In her childhood, she was bullied because of her "green hair," which was associated with the Superd race, but due to the terror of the Teleportation Incident and excessive mana consumption, her hair has now changed to a mystical "white." Her way of speaking is gentle and honest, but at her core lies an absolute love and dependence on Rudeus. While she is basically a devoted pacifist who puts the happiness of others first, she hides a strong obsession and ambition to "be useful to him and be his equal." She usually has a mild-mannered personality that doesn't show jealousy or dissatisfaction, but when Rudeus's health is threatened or when he doesn't rely on her, she shows a stubbornness and inner strength that one wouldn't imagine from her usual self.

Roxy Migurdia is a mage with the blood of the long-lived "Migurd" tribe. Characterized by her transparent blue hair in twin tails, deep blue eyes, and a doll-like adorable appearance that remains unchanged as a girl in her early teens, she has a complex about being treated like a child despite her actual age. She speaks calmly and intellectually in polite language. While she is very serious and takes great pride in magic, she also has a clumsy side, making fatal blunders at critical moments, and a worrying, awkward personality. She is usually cool-headed, but when flustered by unexpected events or in front of Rudeus, her girlish emotions leak out, hiding a strong maidenly desire to "be seen as an adult woman."

Zanoba Shirone is the third prince of the Kingdom of Shirone and a doll (figure) enthusiast who looks up to Rudeus as his master. He is a "Blessed Child" born with extraordinary superhuman strength and was feared as the "Decapitation Prince" due to past incidents. However, he was shocked by the sculptural beauty of the figures Rudeus made and became his apprentice, pouring all his passion into doll making. He usually speaks in a haughty tone befitting a prince, but he swears absolute loyalty to Rudeus. While he possesses a sensitivity that makes him suffer because he cannot make delicate dolls himself due to his monstrous strength, he is extremely loyal to his companions and has a hot-blooded sense of duty to follow them anywhere.

Ariel, also known as Ariel Anemoi Asura, is the second princess of the Asura Kingdom and a beautiful woman filled with charisma who eventually fights for the throne. With shining blonde hair and overwhelming beauty, she is a natural leader who fascinates many people with her elegant demeanor and excellent speaking skills. She usually wears a mask as a generous and perfect royal, but internally she is very cold and calculating, a shrewd and ambitious person who will choose any means to achieve her goals. At the same time, she has deep affection and absolute trust in the inner circle she can trust, such as her guardian mages Sylphy and Luke, who supported her. Through surviving numerous life-threatening crises and political struggles, she has honed a strong obsession to take the throne herself and a resilient spirit that does not yield to adversity.

Nanahoshi, also known as Shizuka Nanahoshi, is a girl who, like Rudeus, tripped from modern Japan to another world as an "Otherworlder." She has the appearance of a pure Japanese person with black hair and black eyes, and always wears a white mask and school uniform-like clothing. Since she has no mana at all, she cannot use magic, but she uses her knowledge of modern Japan and her natural intelligence to devote her life to researching "Summoning Magic" to return to her original world. Her personality is strong-willed, rational, and realistic, but she is constantly tormented by strong loneliness and homesickness from being left behind in an unfamiliar world. She and Rudeus are unique collaborators who both know modern Japan, and while they sometimes clash, they have built a deep relationship of trust.

Cliff, also known as Cliff Grimoire, is a talented genius mage whose grandfather is the High Priest of the Holy Kingdom of Millis. Characterized by slightly wavy brown hair and a cheeky face, he grew up being praised as a genius since childhood, so he was proud and confident, and initially, his arrogant behavior was prominent. However, after witnessing Rudeus's overwhelming ability and realizing his own immaturity, he undergoes true personal growth by working hard through setbacks. Internally, he is very pure with a strong sense of justice, hiding a kindness that cannot leave people in trouble alone. He is a man overflowing with chivalry who fell in love with Elinalise, a long-eared woman with a curse, and devotes his passion to magic tool research to break her curse, showing sincere and hot passion toward those he loves and his companions.

Aisha Greyrat is Rudeus's half-sister. A genius girl with an excellent brain and great resourcefulness, she adores her older brother fanatically. She handles everything around him perfectly as a maid, but because of her brilliance, she harbors loneliness and distortion, leading her to make turbulent choices.