Yuuya Tenjou is the protagonist who transformed from an obese boy into a superhumanly handsome youth by leveling up in another world. He has a timid but kind personality and dominates both the other world and reality with his broken skills. Despite being loved by many women in both worlds due to his looks, he remains humble, often dismissing compliments as undeserved.

Ryo Igarashi is a handsome, athletic student with brown hair and excellent reflexes. With a warm, unprejudiced personality, he became Yuuya's first reliable friend. He also has the unexpected charm of being a hardcore anime fan.

(Otherworlder) The First Princess of the Kingdom of Arseille. After Yuuya saves her life, she falls in love at first sight and aggressively pursues him.

(Otherworld Animal) A Divine Beast (rabbit) holding the title of 'Holy' who protects the world. He speaks human language and boasts overwhelming combat power. Recognizing Yuuya's talent, he becomes a master who passes down his techniques.

(Real Worlder) The daughter of the chairman of Ousei Academy and the main heroine in the real world. After seeing Yuuya's character when he saved her from thugs, she leads him to the elite Ousei Academy.

(Otherworlder) An archer girl who was a disciple of the 'Holy' but came to harbor the power of the 'Vile' seeking the world's destruction. She mostly speaks in short, single-word sentences.

(Otherworld Animal) A Black Fenrir cub that Yuuya first took in from the Great Demon Territory and his reliable partner. Despite his cute appearance, he is a Divine Beast-class magic beast with high intelligence and powerful combat abilities. (Cannot speak human language.)

(Otherworld Animal) A young Moukai, a rare magic beast that wandered into Yuuya's hot spring and was tamed. He looks like a baby wild boar and uses 'Sanctuary' skills to provide beneficial buffs to allies. (Cannot speak human language.)

(Otherworlder) A girl who was a skilled assassin targeting Lexia. After being helped by Yuuya in the Great Demon Territory, she develops feelings for him and becomes Lexia's personal guard and friend.

The First Prince of the Kingdom of Arseille. A key antagonist who hates Lexia due to past burn scars and attempted to have her assassinated.