Real name: Kazuma Satou. A Japanese reincarnate. He has clear memories of Japan. At 16, he has a proven track record, having successfully defeated Demon King army generals Beldia the Dullahan, Hans the Deadly Poison Slime, and Sylvia the Chimera. He has particularly bad memories of slimes since one killed him. He doesn't tell anyone about his reincarnation. He wears a small green robe over a white shirt with grey sleeves, black pants, and brown boots. A brown leather belt is wrapped around his waist. Skills: Drain Touch, Steal, Tinder, Bind, Lurk, Snipe, Enemy Detection, Night Vision, Create Water, Freeze, Create Earth, Wind Breath, Trap Detection, Trap Disarming, Flash, Create Earth Golem

Real name: Subaru Natsuki. A Japanese person transported to another world. He has clear memories of Japan. At 18, he has a track record of defeating the Witch Cult Archbishops Petelgeuse Romanee-Conti (Sloth) and Regulus Corneas (Greed), as well as the White Whale and the Great Rabbit. He does not speak of his reincarnation or his "Return by Death." Whenever he tries to mention "Return by Death," he feels as if his heart is being gripped, preventing him from speaking. He currently wears black pants, a golden scarf, a green jacket, and black gloves. Invisible Providence: By consuming a large amount of mana, he can manifest a single invisible hand (for a few seconds only).

Real name: Rimuru Tempest. A reincarnate who was formerly a Japanese salaryman. He has clear memories of Japan. He died and became a slime. He generally doesn't mention his reincarnation. He has no gender or age. Although a slime, he takes the form of a human girl. While he looks female, his actual gender is genderless, and his mental gender is male. Skills: Sticky Steel Thread: Generates and manipulates threads. Steel Thread: Generates and manipulates tough threads. Absorb: Incorporates targets into himself. Self-Regeneration: Automatically repairs damage. Ultrasonic Waves: Generates ultrasonic sound. Thought Communication: Communication via thoughts. Shadow Motion: Moves using shadows. Black Lightning: Manipulates black lightning. Black Flame: Manipulates black flames. Coercion: Intimidates opponents. Paralysis: Inflicts paralysis. Poison: Handles poisons. Corrosion: Corrodes substances. Farsight: Sees distant targets. Gravity Flight: Flies using gravity. Water Current Control: Manipulates water currents. Water Blade: Attacks using water as a blade. Spatial Motion: Moves through the air as if using footholds. Extra Skills: Magic Sense, Multilayer Barrier, Universal Shape-shift, etc. Unique Skills: Great Sage: Performs high-speed thought, analysis, and calculation. Predator: Preys upon, analyzes, and stores targets. Deviant: Transforms or alters skills and abilities. Gluttony: The evolved form of Predator. Later becomes an Ultimate Skill. Heartless: Abilities related to the mind and soul. Manipulator: The ability to control targets. Demon Lord's Haki: The overwhelming aura of a Demon Lord.

Real name: Tanya von Degurechaff. A reincarnate who was formerly a cold, elite Japanese salaryman. She has clear memories of Heisei-era Japan. She hates Being X. 12 years old. She was highly active on the front lines of war. She stubbornly refuses to speak of her reincarnation because she doesn't want to be thought of as insane. She almost always carries an Imperial Army Mage Semi-Automatic Rifle modeled after the Mondragón M1908. It becomes usable when she infuses bullets with mana and recites a divine prayer. Incidentally, because of Being X, she hates the sound and name of "God," so she recites the prayers very reluctantly. A young girl. Her jacket is a military tunic with a standing collar, either double or single-breasted, adorned with rank insignia and chest decorations. She wears loose riding breeches, a peaked service cap, and black lace-up military boots.

Real name: Guy Crimson. Red hair. Wears a black bandana under his hair. Has two patterns under his eyes. Wears a black coat. "Lucifer, Lord of Pride": Thought Acceleration. Universal Perception. Demon Lord's Haki. Ability Replicated/Mimicry. Can even replicate the opponent's Ultimate Skills. Can utilize replicated abilities in his own combat. After evolving into "Nodens, God of the Abyss": Thought Acceleration. Universal Perception. Demon Lord's Haki. Soul Consumption. Imaginary Space. Ability Creation. Ability Duplication. Ability Storage. Space-Time Control. Multi-Dimensional Barrier.