129.3 kilometers

Doraemon’s weight is set at 129.3 kilograms, and it’s said to be modeled after the average height of a fourth-grade elementary school student. His height and chest measurement are the same number, and there’s an anecdote that he was designed this way so that Doraemon could be seen from the same eye level as children.

Because my ear was gnawed by a mouse, and I cried for three days and nights until the paint peeled off.

The secret behind Doraemon’s blue color is related to what happened after his ears— which he was supposed to have—were gnawed off by a mouse. Shocked by the incident, Doraemon cried for three days and three nights, causing his paint to peel off, and that’s how he turned into the blue color that became his trademark. This backstory reflects a change alongside his emotions and is one of the key episodes for understanding his character more deeply.

cat's cradle

In addition to napping and marksmanship, Nobita has another special skill: cat’s cradle. He’s so good at it that he can create extremely complex shapes. You could say it’s one of his unexpected talents. Try looking for those scenes in the manga!

Chrono-navigation

In Doraemon, when using devices like the time machine or time TV to travel through time, one must follow a law called the Time Travel Act. This is a fictional set of rules established to prevent potential historical alterations and paradoxes that could arise from moving freely through spacetime.

Nanny Cat-Type Robot MS-903 Doraemon

Doraemon’s official name is “MS-903 Doraemon, a cat-shaped robot for childcare.” This name appears in the original manga, where his intended role and manufacturing number are mentioned. While he is affectionately known simply as “Doraemon,” there is an official designation behind that nickname.

The Earth is a demolition bomb.

Doraemon hates mice. When a mouse appeared in the house, he tried to get rid of it, but he lost his cool and pulled out the “Earth-Destroying Bomb” from his four-dimensional pocket—a bomb powerful enough to blow up the planet. However, Nobita lied, saying, “The mouse already ran away,” and managed to defuse the situation. It really shows just how much Doraemon hates mice.

129.3 horsepower

According to official sources, Doraemon’s power is said to be 129.3 horsepower. The number 129.3 is used in many aspects, such as Doraemon’s height being 129.3 cm and his weight 129.3 kg. It also symbolizes his strength as a robot. The origin of the number is related to Doraemon’s birthday, September 3, 2112, and it is cherished as a very important number in Doraemon’s world.