Doraemon is a robotic cat manufactured on September 3, 2112, at the Matsushiba Robot Factory and designated model MS-903. An electrical bolt damaged a critical screw during assembly, leaving him underperforming compared to his peers. Sewashi Nobi, a boy from a family of modest means, purchased the unit at a low cost. Originally yellow, Doraemon’s appearance changed drastically after robotic mice severely damaged his ears. A surgical repair led to complete hair loss and triggered a lasting musophobia. Deeply depressed, he consumed a sadness-inducing potion; his tears washed away the yellow paint, revealing a permanent blue underside. At Sewashi’s request, Doraemon was sent to the 20th century to assist Nobita Nobi, an ancestor, with the mission of improving Nobita’s circumstances and securing the future prosperity of the Nobi family. His appearance is defined by a blue, spherical body, a white face, abdomen, and limbs. The absence of ears gives him a raccoon dog-like look, which often irritates him. He has a red tail and wears a collar with a yellow bell. A four-dimensional pocket on his abdomen stores numerous futuristic gadgets from the 22nd century, which he regularly uses to aid Nobita. Doraemon is kind and helpful but quick-tempered when criticized or mistaken for a raccoon dog. He has a pronounced fondness for dorayaki pastries, which can be used to influence him. His profound fear of mice and doctors often triggers intense panic. His relationship with Nobita is complex and central to many stories. Doraemon acts as protector and guide, helping Nobita navigate academic, social, and personal challenges. Their strong bond is frequently tested by Nobita’s overreliance on gadgets and the unintended consequences that follow. He shares a sibling bond with Dorami, a younger sister model who occasionally visits from the future and often demonstrates greater responsibility. He also holds a recurring, unrequited affection for a feline automaton named Noramyako. While his background has seen variations across different media, the core elements of his manufacture, ear loss, color change, and mission to the past remain consistent. His portrayal in the anthology "40-Shūnen da yo! Coro Coro All-Star Shōgakkō" aligns with his established depiction from the main series.