※ Contains spoilers Note: These explanations are largely based on personal interpretation and may not be entirely accurate.
[Great Ello Dungeon — Upper Layer] Spider (protagonist, believe it or not) No explanation needed. She's... various things. Doesn't have a name yet.
Frog The spider's first victim. From here, the frog's harrowing tale... doesn't begin.
Geji Lots of them. Creepy. Scary.
Snake The first boss. Now he's just trash. Poor guy.
[Great Ello Dungeon — Vertical Shaft ~ Lower Layer] Bee Bzzz bzzz. Has a special bonus effect against spiders. Stab!
Earth Dragon Arava The first taste of despair. Running into a hidden dungeon monster at a low level. Fun times.
Greater Taratect The spider's evolved form. Big. Strong. Terrifying.
Monkey What the—!? You wanna fight!? You got a problem!? —That's what they say while spawning in massive numbers and being an absolute nuisance.
Giant Ape "Oh my, how troublesome~ This is our territory, you know~ You really shouldn't cause trouble~" —That's what they say while occasionally showing up alongside the monkeys and being an absolute nuisance.
Earth Dragon Kaguna The second taste of despair. Level up and come back when you're ready.
[Great Ello Dungeon — Middle Layer] Tatsu no Otoshigo The ultimate musclehead. It's not about whether you can win. It's about whether you'll do it or not. But seriously, don't mess with the ones that are too strong.
Catfish Big mouth. Delicious. Slurp.
Eel Long body. Delicious. Slurp.
Fire Dragon Middle Layer mid-boss. Didn't get much screen time because of the mid-boss designation. Not all that delicious. Shame.
Fire Dragon Rend Middle Layer final boss. Strong because he's the final boss. The first dragon the spider actually fought seriously.
[Great Ello Dungeon — Wandering Around] Dungeon Guide Guy (Basgas) A veteran dungeon guide. Actually pretty strong. A cool, seasoned nice guy.
Knight Captain A noble's son without inheritance rights. Pretty desperate because of the no-inheritance thing. Still a kid, though, so pretty clueless about how the world works.
Adventurer Killed by the Snake An adventurer party that was nearly wiped out by the snake. Rescued by the spider, after which they went on a full-blown missionary campaign.
Earth Dragon Geere Kaguna for hardness, Geere for speed. Each one is a pain on its own, but when they team up, the pain doesn't just double — it skyrockets.
Arch Taratect A spider-type monster with dragon-class power. Absurdly strong. And yet... sunk by a cheap trick. Rest in peace.
Earth Dragon Arava Revenge match. Yep, you really were strong after all.
Magic-Using Old Man (Ronant) W-Wait! Please, let me see more! Show me more!
Summoner A summoner who commands the Four
[Outside] Noblewoman A noblewoman who was being attacked by bandits. The vampire kid's mother. A devout follower of the Goddess religion.
Town Mayor The noblewoman's husband. The vampire kid's father.
Rude Old Man A rude old man. Issued orders with an arrogant attitude, and when he got ignored, he sent an assassin after them like an idiot. Got assassinated in return.
Queen Taratect The spider's mother. She ate her. It's that kind of relationship.
Babies What are these absurdly capable kids? They took impeccable care of their useless mother. Put to work like draft horses the moment they were born. Labor standards, people. Look into them.
Earth Dragons of the Lowest Layer Stood their ground to stall the Demon King with a resolve to die. True men.
Hero (young) A Hero who ended up on the battlefield for some reason. The scarf around his neck was made from spider's silk, but he never realized it.
Earth Dragon Trio Kaguna, Geere, and the addition of Fuito to round out the trio. Leveled up and came back for round two — only to get beaten to a pulp. Pathetic.
[Demon King's Army] Demon King The most ancient divine beast. An Origin Taratect — the ancestor of all spiders. Existed long before the System was built. Sensed a crisis approaching the world and finally dragged herself into action. Almost immediately, the spiders who should have been her subordinates turned against her, and after a series of twists and turns, she ended up class-changing into the Disappointing Demon King.
Bart The practical operator who actually runs the Demon race. An overworked man constantly jerked around by the Demon King.
Aguerna First Army Corps Commander during the Human-Demon war. A veteran of the Demon race so accomplished people say he could have been Demon King himself. Said to have connections with the Elves.
Sartnalia Second Army Corps Commander during the Human-Demon war. A succubus and Bart's childhood friend. Secretly trying to establish ties with the Elves.
Melazofis Fourth Army Corps Commander during the Human-Demon war. A pale-faced man. Calls
Hyui Sixth Army Corps Commander during the Human-Demon war. A baby-faced mage. Being a long-lived member of the Demon race, he's older than he looks.
Blow Seventh Army Corps Commander during the Human-Demon war. Bart's younger brother. Unlike his elder brother, he has a violent temperament. Can't stand the Demon King.
Raas Eighth Army Corps Commander during the Human-Demon war. Apparently has all sorts of problems.
Black Ninth Army Corps Commander during the Human-Demon war. A man shrouded entirely in black. His true identity is Administrator Gueriedistodies.
White Tenth Army Corps Commander during the Human-Demon war. A girl dressed entirely in white.
[Shun's Arc]
Ana Shun and Sue's personal maid. A half-Elf mage.
Clevea Shun and Sue's personal maid. Despite being a woman, she was active as a knight.
The King Shun and Sue's biological father. A kind-hearted man, but mediocre as a politician.
Pulton A knight's son. Ended up in the same group as Shun during school extracurricular activities. Has sworn his loyalty to Shun, who is a prince.
Teacher Oriza A magic instructor with not much motivation. Assigned as supervisor for Shun's extracurricular group.
Reston Shun's half-brother. The third prince. Secretly cooperating with the Elves behind the scenes.
Goief A veteran dungeon guide. Basgas's son.
Basgas A retired dungeon guide. Came out of retirement to guide Shun and the others. Quite the powerhouse for a member of the Human race.
Earth Dragon Ekisa An Earth Dragon that just evolved and became more aggressive. Still in the Upper Layer because it had just evolved.
Remnants of Nightmare A monster resembling a white spider. Speaks through thought transmission. Has the peculiar habit of not attacking unless provoked. An extremely powerful monster.
[Previous Hero's Party]
Hyrins Julius's childhood friend. Served as the party's shield-bearer and vice-leader.
Yana A Holy Priestess dispatched from the Church to accompany the Hero.
Jisukan A former adventurer. The oldest member of the Hero's party, contributing through the experience he gained as an adventurer.
Horkin A former thief. Reformed and joined the Hero's party. Knowledgeable about the underworld and its workings.
[Reincarnators] Yamada Shunsuke Real name: Shurein Zagan Analeit. The fourth prince. Born into royalty and raised in a privileged environment without a care in the world. However, following the death of his brother Julius, he inherited the Hero's Title, only to be dragged down through
Oshima Kanata Real name:
Okazaki Kanami A former teacher who reincarnated as an Elf. Commonly known as Oka-chan. Has been scrambling ever since her reincarnation for the sake of her students.
Hasebe Yuka An orphan who was discovered by the Church for her extraordinary talent and taken in as a Holy Priestess candidate.
Natsume Kengo Born as a prince of the Empire. As a reincarnator, he possesses cheat-like abilities, which in turn made him arrogant. Eventually, he went completely out of control.
Hayashi Kota Dead (?).
Kogure
Sakurazaki Kazunari Dead (?).
Kudo
Ogiwara Kenichi A cook under protection at the Elf village. Actually a spy who infiltrated the group.
Tagawa
Kushiya Asaga A former adventurer, recently taken in at the Elf village. Childhood friends with Kunihiko in both their previous life and this one — currently dating.
Sasajima Kyoya A friend of Shun and Kathia from their previous life. Born as a Goblin. Suddenly appears before Shun during the battle at the Elf village.
Negishi Akiko In her previous life, a gloomy girl who was badmouthed behind her back by Rihoko and the others. Born as a vampire in this life. Appears before Shun together with Kyoya during the battle at the Elf village.
[Other Key Figures] Gueriedistodies One of the Administrators of the world. A dragon. The overworked one.
D A self-proclaimed wicked god of the worst kind. Apparently was in the same classroom as the reincarnators. The person responsible for the reincarnators' deaths, and out of guilt, she was the one who reincarnated them. True to her nature as a wicked god, she did so with malice.
The Pope The figure who leads the Church. Hostile toward Potimas. Maxed out on Taboo.
The Previous Hero and the Demon King Both wielders of dimensional magic. Modified dimensional magic to launch an attack against D. The aftershock of that attack caused the reincarnators' classroom to explode — and that's what set the entire story in motion.