Kenya Misaki is a young boy who appears as a supporting character in the story. He is one of several children summoned from another world to serve as students at the Freedom Academy. Unlike the protagonist, Kenya was not reincarnated but was forcibly brought to this new world against his will through a summoning ritual during his early childhood. The process of being summoned had severe physical consequences, as the intense magical energies overwhelmed his small body, leaving him with a constitution that drastically shortened his natural lifespan. This grim prognosis led to him and others in similar situations being labeled as failures by those who summoned them, a stigma that deeply affects his outlook.

In terms of personality, Kenya is defined by his immense energy, his mischievous nature, and a notably aggressive and defiant streak. This behavior is a direct result of his resentment towards his involuntary displacement and the rejection he experienced. He channels his frustration and volatility into rebellious antics, frequently clashing with authority figures. This conduct earned him a reputation among the teaching staff as a troublesome student, leading to his placement in a specialized class designated for unruly children. This is the class where he first meets Rimuru Tempest, who becomes his new teacher. During his initial encounters with Rimuru, Kenya displays an irreverent and insubordinate demeanor, deliberately trying to provoke a reaction and test the limits of his new instructor.

Despite his outwardly combative and energetic exterior, Kenya harbors deep-seated bitterness and pain. His actions are largely motivated by his resentment over being uprooted from his former life, his anger at being cast aside as a failure, and the constant, unspoken awareness of his own limited time. His journey within the story begins with hostility and defiance, but he is a key member of the group of children who come under the care and protection of Rimuru. Rimuru takes on the task of trying to save them from their fates, a mission originally entrusted to their previous caretaker, Shizue. Kenya respects Shizue as a mentor, having trained alongside his fellow summoned youths under her guidance before her death.

One of the most significant turning points for Kenya occurs during a spirit summoning ritual intended to stabilize his condition. While the process is largely straightforward for many of the children, Kenya has a unique experience; he is able to communicate with a Greater Elemental of Light, which chooses to form a bond with him. This partnership is crucial, as it not only grants him access to powerful spirit-based abilities but also serves to stabilize his unstable body, effectively stalling the countdown to his premature death. This bond with the Spirit of Light threads an element of hope into his otherwise grim circumstances and begins to temper his more self-destructive impulses.

Kenya possesses notable abilities centered on fire magic, a skill he shows an affinity for from a young age. His swordsmanship is also described as decent. The bond with the Greater Elemental of Light amplifies these powers significantly, although the full scope of this enhancement develops over time. His physical appearance is that of a small, childlike frame, with spiky orange hair and bright, matching orange eyes. His youthful physique is a remnant of his age at the time of his summoning. His defiant spirit, his growing bond with the Spirit of Light, and the fragile hope it provides are central to his development as he navigates the challenges of a world that initially rejected him.