Kosaku Tokita invented the DC Mini, a revolutionary device enabling shared dream experiences for psychiatric therapy. Approximately 26 years old with brown hair and brown eyes, he exhibits significant obesity and typically wears casual attire like an orange T-shirt. Tokita displays a childlike, eccentric personality, blending enthusiasm for his work with naivete. His workspace features action figures and amusement park souvenirs, reflecting his playful nature. Despite his genius-level intellect in robotics and dream technology, he relies heavily on colleague Dr. Atsuko Chiba for practical guidance and emotional support. As a respected scientist at the Institute for Psychiatric Research, Tokita developed the DC Mini to aid mental health treatment. His carefree demeanor includes a large appetite, often depicted ordering multiple dishes or consuming junk food. Though generally uninvolved in field operations, he shows deep concern when his invention is stolen and misused to harm others. Assistant Kei Himuro harbors hidden resentment from professional jealousy, a dynamic Tokita remains unaware of. During the stolen DC Mini crisis, Tokita's dream form manifests as a giant robot, embodying his subconscious affinity for mechanical fantasies. Initially overwhelmed by the dream world's chaos, this robotic form inadvertently performs heroic acts like destroying a giant doll threatening colleagues, symbolizing his latent capability under duress despite typical clumsiness. His vulnerability to dream manipulation causes temporary incapacitation, requiring rescue by Dr. Chiba and Detective Konakawa. Tokita's relationship with Dr. Chiba forms a core emotional arc. He openly expresses affection, calling her "At-chan." Chiba initially responds with professional detachment, though her repressed romantic feelings surface climatically when a spectral projection confesses love during the dream-reality merger. Post-crisis, Chiba adopts Tokita's surname, strongly implying marriage and marking his integration into her reconciled identity. Symbolically, Tokita blends traditional and modern Japanese masculinity, contrasting authority figures through unconventional appearance and emotional transparency. His childlike traits coexist with scientific rigor, illustrating themes of multifaceted identity.