Doraemon is a cat-type robot in the 22nd century. He is 129.3 cm tall, the girth of the chest are 129.3 cm and his weight is 129.3 kg. He has a pocket of the fourth dimension at his stomach. His favorite food is dorayaki which he eats everyday.
He has a younger sister whose name is Dorami. He came to the house of Nobi Nobita from the 22nd century taking a time machine, and he lives with the Nobi. Nobita, the only child of the family, is a friend of Doraemon. He is bullied by his friend Jaian and Suneo almost everyday. In such a time, Doraemon takes out tools made in the 22nd century from his pocket of the fourth dimension for Nobita to punish them.
So, Nobita always trusts Doraemon.