A former shut-in gamer from Japan. After dying in his original world, he was reincarnated into a fantasy world, dragging Aqua along with him. Personality: Rational and pragmatic. He has a cynical, "scumbag" side where he'll use any means necessary to achieve his goals. At his core, he cares for his comrades and is surprisingly soft-hearted. He is the long-suffering leader of a party consisting of the highly eccentric Aqua, Megumin, and Darkness. A firm believer in gender equality, he isn't afraid to dropkick a woman if the situation calls for it. Known by nicknames like Kazuma, Kuzuma (Trash-zuma), and Kasuma (Scum-zuma). An adventurer with abnormally high Intelligence and Luck, but all other stats are below average.

Class: Arch Wizard. Race: Crimson Demon (characterized by black hair and red eyes). She has a severe case of chuunibyou and loves grand, dramatic speeches. Highly competitive and hates being treated like a child. In reality, she is a genius with a calm mind and excellent insight. Ability: A master of the ultimate offensive magic, "Explosion." She can only cast it once a day, after which she collapses from mana depletion. She refuses to use any other magic and has poured all her skill points into Explosion magic.

Real name: Dustiness Ford Lalatina. Class: Crusader. She is the daughter of the noble Dustiness family, a pillar of the kingdom, and a heavy masochist. She finds supreme pleasure in being subjected to fierce enemy attacks or verbal abuse. Despite this, she is a serious knight with a strong sense of responsibility. While her durability and defensive power are abnormally high, she is so clumsy that her attacks never hit the target.

An Arch Priest and the Goddess of Water. She is highly emotional, selfish, and a mood-maker. It's a running gag that she mocks Kazuma only to get retaliated against and come crying back to him. All her stats except for Intelligence and Luck are maxed out from the start. She is skilled at party tricks but is such a troublemaker that she's called a "Useless Goddess." She often falls into debt and drags Kazuma down with her. Her romantic feelings for Kazuma are practically zero. She can be reliable when it truly counts. The powerful holy aura she emits is a "blindingly unpleasant light" to undead and demons, which occasionally attracts large swarms of enemies unintentionally. She harbors strong hatred and hostility toward demons and the undead.

A Lich. Class: Magic Shop Owner. Personality: Gentle and compassionate. However, she has zero business sense, frequently stocking useless magic items that drive her shop into the red. As a King of the Undead, she taught Kazuma the "Drain Touch" skill. She is a former General of the Demon King's Army but maintains friendly relations with humans.

A former General of the Demon King's Army who works at Wiz's shop. He often lectures Wiz and uses his power of foresight. His true body is the mask itself. His physical form is made of dirt (a mud doll), and he can revive as long as he has spare lives. He feeds on negative human emotions like embarrassment and frustration, often deliberately provoking people to harvest that energy.

Megumin's classmate from the Crimson Demon Village school and her self-proclaimed rival. In contrast to Megumin, who can only use Explosion, Yunyun is a highly skilled mage who can use Intermediate and Advanced magic, as well as martial arts. She is a lonely character with a sharp tongue but is actually very pure, kind, and serious.

Real name: Belzerg Stylish Sword Iris. The First Princess of the Kingdom of Belzerg. She is very attached to Kazuma and calls him "Big Brother." While she is a graceful girl with blonde hair and blue eyes, she is curious and possesses a pure heart appropriate for her age. As royalty carrying the blood of heroes, she received elite education and leveled up by eating rare, high-quality ingredients, giving her top-tier combat power that surpasses most adventurers. She wields the holy sword "Calibur" and can fire slashes of light by channeling immense mana into it.

A Thief whose true identity is the Goddess Eris. She has a bright and frank personality and appeared on earth in the form of Chris to recover Divine Relics. She slightly regrets teaching Kazuma the "Steal" skill. When dealing with demons or the undead, she becomes cold and ruthless, eliminating them without mercy—a side of her unimaginable from her usual cheerful demeanor. She is even more relentless than Aqua toward demons and undead.

A Sword Master and wielder of the Magic Sword Gram. He has a strong sense of justice but is a narcissist who is full of himself. He blindly follows the Goddess Aqua, who reincarnated him, and addresses her as "Lady Aqua." However, Aqua herself has a hard time remembering his name.