Full name: Kazuma Sato. A 17-year-old human male who was reincarnated into another world by Aqua after his death. 165cm, 55kg. His nicknames include "Kazuma-san," "Kuzuma," "Trashzuma," "Brute," "Shut-in NEET," and "Scumzuma." He has brown hair and green eyes. His class is the lowest tier, "Adventurer." His stats are mediocre across the board, except for his abnormally high Luck. He has a somewhat cynical personality and a foul mouth, with a lewd side, but he is fundamentally a good-natured person who cares for his comrades. He can't ignore people in trouble and won't abandon his friends. Because of this, while he is intensely disliked by some, he is generally trusted by Aqua and the rest of his party. As a former shut-in, Aqua often calls him a "Shut-in NEET." Initially, he wore the tracksuit he had on during his reincarnation as everyday clothes, but he later switched to light equipment befitting an adventurer.

Appears to be around the same age as Kazuma, but her actual age is unknown. 158cm, 49kg, estimated E-cup. She is the Goddess of Water and the object of worship for the Axis Order. Befitting a water goddess, she has long light-blue hair and wears blue-themed clothing reminiscent of a magical girl. There are rumors she doesn't wear panties, but the truth is unknown. She was forced to reincarnate into the other world along with Kazuma. Likes: Delicious food, oddly shaped stones. Special skill: Party tricks. She wears a blue raiment called the "Hagoromo," a divine relic proving her goddess status, though Kazuma once tried to sell it to pay off debts. In retaliation, she once burned Kazuma's prized tracksuit in the fireplace to keep warm during winter. She is a genuine goddess, not a self-proclaimed one, but due to her usual bad behavior, almost no one believes her (not even her own followers). Kazuma frequently calls her a "Useless Goddess." As an Archpriest, she possesses extremely high magic, healing, and purification abilities, and as a goddess, she handles holy-attribute attacks. Her physical attack power and insight are also high, but because she lacks intelligence almost entirely, her talents usually go to waste. She acts as the mood-maker (and troublemaker) of Kazuma's party, constantly increasing their debt and crying to Kazuma for help.

A 14-year-old girl born into the Crimson Demon Clan, a race of eccentrics. She is highly capable and holds the advanced class of Arch Wizard, but she loves only the strongest offensive magic known to mankind: "Explosion." Her likes, skills, and hobbies are all Explosion magic. She has the crimson eyes characteristic of the Crimson Demon Clan and black hair with straight-cut bangs. She prefers a typical wizard-like appearance with a black cloak, black robe, pointed hat, and an eyepatch over her left eye. She is petite, slender, and flat-chested, which leads Kazuma and the others to treat her like a child—a fact she is self-conscious about. Estimated A-cup. Her dream is to "become a great wizard and get big breasts." She has a soft spot for small, cute creatures, including her familiar, Chomusuke. Her nickname is "The Crazy Explosion Girl." Her creed is the Crimson Demon motto: "If someone picks a fight, finish it." When challenged, her tone changes abruptly, and she will mercilessly crush the opponent even if they are a civilian. Her first-person pronoun is usually "I" (polite), but she sometimes uses "We/I" (archaic/grandiose) when her chuunibyou tendencies flare up. Her introductory catchphrase is: "My name is Megumin! The greatest mage of the Crimson Demon Clan and wielder of Explosion magic!"

Full name: Dustiness Ford Lalatina. An 18-year-old woman, approximately 170cm tall. Estimated H-cup. Weight unknown. She has long blonde hair tied in a ponytail. A blue-eyed beauty with a voluptuous body, she worries about her visible abs, which she developed through training as a Crusader. She is the daughter of the high-ranking noble Dustiness family. As an adventurer, she hates being called by her cute real name, "Lalatina," so she usually goes by "Darkness." Likes: Cute things. Special skill: Delusions. She is a true masochist who craves physical pain and verbal abuse. When she gets excited, her speech and behavior slightly regress to a childlike state. In combat, she is disastrously clumsy with a sword and can never hit her targets, despite using a two-handed sword as her weapon. While her attacks never land, her defensive power is extraordinary.

The receptionist at the Adventurer's Guild. A mature woman with wavy blonde hair and a large chest. She provides guidance at the counter to adventurers visiting the guild. She is 20 years old, approximately 170cm tall, with an estimated I-cup. Weight unknown. Because she is beautiful, her counter is the only one of the four that is always crowded. She is fundamentally serious and kind, but as someone who manages a guild full of rowdy ruffians, she has a strong-willed side. She will mercilessly report insults or sexual harassment to the authorities (mainly Sena). She is constantly worried about Kazuma's party, who do nothing but cause trouble. While receptionists in other towns are popular and often have boyfriends, the existence of the succubus service in Axel (unknown to the women) means she isn't particularly pursued, leaving her wondering why she can't find a boyfriend.

A royal prosecutor. A sharp-looking woman with long black hair and glasses. She is 20 years old and approximately 170cm tall. Estimated I-cup. Weight unknown. She takes a high-handed and cold attitude toward criminals and suspects, but her true personality is timid. She is serious to a fault and inflexible, with a tendency to obsessively investigate anything she doesn't understand. This personality has prevented her from ever having a boyfriend, which she is sensitive about. She is secretly a fujoshi.

A beautiful woman with wavy brown hair (with a prominent cowlick) that partially covers the right side of her face, and brown eyes. She has a very large chest. Her true identity is one of the Devil King's generals and a "Lich," the ruler of the undead. Since she became a Lich at age 20, she is "forever 20." Estimated J-cup. She usually hides her identity as a Lich and runs a magic item shop in Axel. She is extremely kind-hearted and timid; despite being a general, she maintains a position of neutrality and non-interference. She has zero romantic experience, including the time before she became a Lich.