Laios Touden is a tallman adventurer and the leader of an exploration party that ventures into the labyrinth beneath the island where the Lunatic Magician's dungeon lies. He is twenty-six years old and stands one hundred eighty-five centimeters tall. He was born in a peaceful mountain village in the northern continent, where his father served as the village chief. His childhood was mostly carefree, spent playing with his younger sister, Falin, and their dogs. When villagers began to fear Falin because of her magical talents, Laios grew disgusted with their treatment of her and eventually left the village. He attempted to join the military but could not adapt, and later took work with a passing caravan before traveling south to the island where the dungeon is located.

Laios is calm and even-tempered in most situations, but he becomes intensely animated when the subject of monsters arises. He speaks rapidly, gestures emphatically, and displays a level of enthusiasm that often baffles or irritates those around him. His fascination with monsters extends beyond combat tactics; he is deeply interested in their biology, mythology, and, most notably, how they might taste. This passion drives much of his decision-making and leads him to experiment with cooking dungeon creatures, a practice he adopts out of necessity after the party loses its supplies. Despite his intelligence and expertise in monster-related matters, he struggles with social interactions. He frequently misses social cues, speaks with blunt honesty, and makes remarks that others find insensitive, such as comparing Marcille’s mixed heritage to that of a mule or commenting that his sister’s death gave the party an opportunity to try a rare monster dish. He intends such statements as attempts to find a positive perspective, but they are often misinterpreted as callous.

His primary motivation throughout the story is to rescue Falin, who was eaten by a red dragon while teleporting the party to safety. Laios and the remaining members of his original group, Marcille and Chilchuck, descend into the dungeon to retrieve her body before it is fully digested, surviving by cooking and eating the monsters they encounter. This goal defines the party’s journey and drives Laios forward. He shows little interest in wealth, fame, or conventional ambition, preferring a simple life centered on exploration and curiosity. His reverence for monsters and his matter-of-fact attitude toward violence lead many characters to view him as unsettling or potentially dangerous, yet he consistently proves himself considerate, self-sacrificing, and open to forming friendships with humans and non-humans alike, including orcs.

Laios serves as the party’s leader and front-line fighter. He is a strong and resourceful swordsman, wielding a longsword and later a semi-sentient weapon named Kensuke that can sense danger and move independently. He also possesses basic healing magic, learned from Falin and later refined under Marcille’s guidance. His deep knowledge of monster biology allows him to devise effective battle strategies and identify weaknesses that others overlook. For example, he deduced that the living armors were not enchanted suits but independent organisms, and he crafted protective frog suits to shield the party from tentacle attacks. He also has some ability in monster-based cooking, though he is less skilled than Senshi. Outside of combat, he is adept at drawing, a skill honed by sketching monsters from The Dungeon Gourmet Guide since childhood, and he can produce an uncanny impression of a dog that intimidates certain creatures.

His key relationships shape his development. His bond with Falin is the emotional core of the story; he feels guilt for having left her behind in their village and is determined to save her no matter the cost. Marcille, who met Laios through Falin, initially worried that he had pulled Falin away from her studies, but the two eventually formed a mutual partnership. Despite Marcille’s discomfort with eating monsters, Laios consistently prioritizes her safety, often giving her protective gear and placing her well-being above that of others. Chilchuck, the half-foot locksmith, often grows frustrated with Laios’s social clumsiness and monomania, but they maintain a functional working relationship. Senshi, the dwarf who joins the party, shares Laios’s interest in cooking and provides practical knowledge that Laios eagerly absorbs, though Laios occasionally questions Senshi’s trust in tamed monsters.

Over the course of the story, Laios undergoes notable development. His initial single-minded focus on monsters begins to expand as he learns to better recognize the needs and feelings of his companions, even if his social skills remain awkward. He starts to take greater responsibility as a leader, balancing his curiosity with the safety of the group. His journey also forces him to confront his past isolation and his complicated feelings about his village and family, leading to a deeper understanding of himself. Ultimately, he proves his worth as a capable, loyal, and surprisingly compassionate adventurer, despite the unease he often inspires in others.