Dr. Kohsaku Tokita, a research scientist, revolutionized psychiatric therapy by inventing the DC Mini, a device enabling shared dream experiences. He possesses extreme obesity, short brown hair, and brown eyes, typically dressing in casual attire like an orange shirt. His physical stature often impedes movement, leading to situations like becoming stuck in elevators, while his substantial appetite is visually emphasized through scenes of excessive eating. Tokita exhibits childlike enthusiasm and innocence, displaying eccentric behavior and absentmindedness. Despite his genius-level intellect, he heavily relies on his colleague Dr. Atsuko Chiba for guidance and emotional support, affectionately calling her "At-chan." His naivety contributes to critical security flaws in the DC Mini, enabling its misuse. Professionally, he collaborates closely with Chiba and Dr. Torataro Shima at the Institute for Psychiatric Research, where his invention faces ethical opposition from Chairman Inui. His background includes a longstanding friendship with assistant Kei Himuro, whom he frequented amusement parks with. Himuro later becomes a victim of the stolen DC Mini, trapped in a dream state that Tokita identifies during the investigation. Tokita's personal history reveals social insecurities and a reliance on his mother, residing in employee housing. His character development centers on his relationship with Chiba. Initially, Chiba represses romantic feelings, exhibiting harshness toward him in reality while interacting more freely in dreams. During the dream-reality merger crisis, Chiba confronts these repressed emotions, confessing her love publicly. This acknowledgment catalyzes Tokita’s transition from vulnerability to active resilience, manifesting in the dream world as a protective giant robot. Post-crisis, their relationship solidifies, with Chiba adopting his surname, implying marriage. In the novel, Tokita’s traits are less exaggerated; his obesity is noted but not morbid, and his romantic bond with Chiba develops gradually through years of collaboration. The narrative includes his increased confidence following the DC Mini incident and explicit engagement to Chiba.