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 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.

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.

Jaiko

Gian’s younger sister, Jaiko, is a cute girl with a gentle personality that contrasts with her brother’s. She dreams of becoming a manga artist. She’s dependable yet sensitive, and she greatly respects her brother Gian and is very fond of Nobita.

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.

22nd century

Doraemon is a robot who came from the future in the 22nd century. In terms of the Gregorian calendar, the 22nd century refers to the years 2101 to 2200, and the setting is that Doraemon was born in 2112 at the “Matsushiba Robot Factory.” Although there were scenes in the early setup where it was described as the 21st century, it was later fixed as the 22nd century—partly to align with “129.3.” That change is also an interesting point when discussing Doraemon.

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!

Because it’s floating by a few millimeters.

Doraemon’s feet float 2–3 mm above the ground thanks to an anti-gravity device. Because they don’t touch the ground, they never get dirty. You can picture him always barefoot, without wearing shoes.

In the closet

Doraemon’s usual sleeping spot is inside the closet in Nobita’s room. This is a familiar scene in the original manga and the anime, beloved by many fans. They use the closet like a bunk bed: Doraemon sleeps on the upper level, while the lower level is for storing belongings. It’s also memorable how they make use of the small space like a secret base.

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.