His total mana capacity is equal to or greater than that of the Demon God Laplace. Because it is abnormally vast for a human, those who can see mana, like Kishirika, find it unnatural and describe it as "creepy." However, because a human body cannot withstand the "fighting style that uses mana to its absolute limit" like Laplace's could, he cannot become as strong as Laplace. Regarding voiceless incantation, it is a technique so rare that there was only one other user at the Ranoa University of Magic.

Originally from Buena Village, she was bullied in her childhood because of her green hair. Rudeus saved her, and they became close friends, leading her to develop feelings for him. While her hair was originally green, it turned white due to the effects of the teleportation incident and mana exhaustion. She is the same age as Rudeus, born one month earlier. As a result of Rudeus's tutoring from a young age and her own efforts, she possesses a considerable mana capacity and can use magic with voiceless incantation. Regarding voiceless incantation, it is a technique so rare that there was only one other user at the Ranoa University of Magic. She can use voiceless incantation for healing and detoxification magic, which Rudeus cannot do. Unlike Rudeus, she cannot use two types of magic simultaneously, so she activates mixed magic by casting them with a slight time delay.

She has a fragile mentality and is easily backed into a corner. When she first arrived, she was briefly excited by the world of swords and magic, but she struggled to adapt to phenomena that ignored physical laws and differences in lifestyle habits, leading her to keep others at a distance. However, her attitude softened after she began cooperating with Rudeus. Since being saved in Chapter 15, she has prioritized Rudeus's future over her own return. To find her friends Akito Shinohara and Seiji Kuroki, who may have come to this world with her, and to find a way back to Japan, she mastered the Human Tongue in one year. In the following year, she used her knowledge of modern Japan, the backing of the Dragon God, and her own negotiation skills to earn money in the Asura Kingdom. The year after that, she used teleportation circles to travel the world. At the Red Dragon's Lower Jaw, she vaguely sensed that Rudeus, who was nearly killed by the Dragon God Orsted, was a fellow world-traveler and interceded to save his life. After being told by Armored Dragon King Perugius, "Perhaps you were summoned to this world by someone's hand," she enrolled in the Ranoa University of Magic to research summoning arts. She later reunited with Rudeus and formed a cooperative relationship. Furthermore, with the help of Cliff and Zanoba, she succeeded in summoning plastic bottles and watermelons. In exchange for teaching her research results, she seeks to learn summoning arts from Perugius at the Floating Fortress.

One of the three heroes who slew the Demon God, and the master of the Floating Fortress Chaos Breaker. The child of the first Armored Dragon King Dora, and the current Armored Dragon King. He was named by Laplace at Dora's request. He is one of the ancient Dragon Race who transferred to the modern era via a reincarnation method, but he has no memories of his previous life. An authority on summoning magic, his skills in summoning and barrier magic are God-class, while his other skills are generally around Saint-class. He is attended by twelve familiars, and he himself attacks enemies weakened by the Front Dragon Gate and Rear Dragon Gate with his mana claws. His individual combat ability is Emperor-class, and including all his summons, he ranks among the lower seats of the world's Great Powers. He dislikes the Demon Race and forbids them from entering the Floating Fortress. However, he is deeply loyal to his debts; he granted permission to sell dolls of Ruijerd Superdia, a demon who saved his life during the Laplace Campaign. He has a deep appreciation for the arts and is on good terms with Zanoba Shireone. He also responded positively to Rudeus's creation of deformed dolls that simplify and abstract human features. However, he dislikes the artworks of the Asura Kingdom created solely for aristocratic vanity.

The grandson of the Pope of the Millis Church. A quarter-blood with a father who is half-human and half-hobbit and a human mother. Consequently, he is short in stature. While his talent for magic is exceptional, he is an amateur in combat, possessing only enough strength to win a common brawl. After meeting Elinalise, he demonstrated a talent for creating magic items, developing tools to mitigate the curses of Elinalise and the Dragon God Orsted. He has been instrumental in the development of Zariff's prosthetic hand and the Magic Armor.

An Elf with the beauty of a high-born lady, featuring radiant blonde hair styled in elegant rolls. A former member of the adventurer party "Fang of the Black Wolf." After joining up with Rudeus, she followed him to enroll in the University of Magic in Sharia, Ranoa Kingdom. While she was scouting for men at the academy, she was confessed to by Cliff, who fell in love at first sight. She was eventually won over by his passion and began a relationship with him.

The third prince of the Shireone Kingdom. He has a long face and wears round glasses. A severe doll fetishist, he had no interest in anything other than dolls and hated humans as beings that restricted his freedom. However, he was captivated by the Roxy doll made by Rudeus, becoming his devoted disciple. Born as a "Blessed Child of Herculean Strength," he possesses the power to easily pull off a human head and a sturdy body that nullifies most physical attacks, though his defense against magic and heat is low.

The second princess of the Asura Kingdom. The only daughter of the Asura Queen Consort, she is third in the line of succession despite being female. She has silky long blonde hair styled with braids. She possesses a charismatic voice that is pleasant to listen to. Considered the most beautiful girl among the characters. She possesses both a sadistic desire to be aroused by pinning down and dominating the strong, and a masochistic desire to be aroused by being pinned down herself.

The second son of the Notos family and Ariel's guardian knight. He is Rudeus's cousin. He wears his brown hair swept back and possesses one of the finest faces in the Asura Kingdom. He has received elite education as a guardian knight since birth, but his swordsmanship is mediocre—Intermediate in the Sword God Style and Beginner in the Water God Style—and even Sylphi flatly stated he is weak. However, having served as Ariel's bodyguard since he can remember, he possesses high loyalty and is trusted by her, sharing a strong bond with his comrades. A womanizer, he is popular due to his looks and wealth of conversation topics, often surrounding himself with women and claiming he only dates up to two at a time—one for each arm. However, because he has often slept with women and then silenced them with money, he is loathed like a snake by some girls. Like a true Notos, he loves large breasts. While he is confident in his eye for women, he lacks an eye for men and had misunderstood Rudeus's character.