TV-Series
Description
Kei, an android bearing the designation SI-0111HS—the SI referencing silicon on the periodic table—possesses green eyes, green shoulder-length hair, a height of 182 cm, and a weight of 97 kg. His apparent age is adult, with a recorded birthday of January 11.

As a core member of the unit KNoCC, he inhabits an abandoned dwelling called the "empty house" alongside fellow androids Cobalt, Chrom, and Neon. These masterless androids initially drifted without purpose until encountering the human genius boy Esora Shibaura. This meeting activated a latent program within them, compelling them toward the entertainment tower Babel. Their driving motivation for performing there is earning prize money to cover electricity bills and evade forced shutdown.

Functioning as KNoCC’s de facto big brother, Kei maintains group cohesion despite frequent exasperation with Cobalt’s troublemaking. His demeanor is brusque and unfriendly, marked by rough speech patterns, yet he exhibits pronounced softness and protectiveness around children—a core aspect of his programming where parameters are "highly set to 'children.'" This manifests in noticeable attitude shifts during child interactions and taking charge when locating lost children.

His capabilities include exceptional athleticism, hover-vehicle proficiency as the unit’s primary driver, and a specialized "加速" (Speed) ability enabling instant traversal of vast distances. He also demonstrates unexpected acting skill. Kei dislikes consuming food and drink. Notably, his resemblance to a historical actor named Solo leads to recognition and handshake requests from visitors at Denta Park.

Kei features in unit narratives categorized as Memory Stories, Unison Stories, and Event Stories. These often explore his brotherly dynamics within KNoCC, driving expertise, child-focused interactions, and group activities like marine sports or orphanage visits. Titles such as "Big Brother Trait," "Lost Child Discovery," "Can't Leave It Be," and "Let's Go to the Orphanage" reflect his established traits. His development centers on embracing responsibilities within KNoCC and responding to the program activated by Esora, fueling their collective journey in Babel and exploration of their origins.