Doraemon

Doraemon (Blue Ball) is a blue robotic cat from the 22nd century, who weighs 129.3kg (285 lbs) and measures at 129.3cm (4'3") tall. He is manufactured on September 3rd in the year 2112, bearing the code MS-903, at the Matsushiba Robot Factory. Doraemon (Blue Ball) is considered a substandard product because many of his robotic features (ie. radar whiskers and cat-calling bell) malfunctioned after production. During his manufacture, he got struck by lighting and lost an important screw that is part of his brain, thus affecting his performance in both his studies and towards society. His favourite food isdorayaki, a Japanese treat consisting of two pancake-like patties wrapped around a filling of sweet red bean paste.

According to a story arc in the spin-off manga series, "The Doraemons", Doraemon's original paint colour was yellow. He changed colour after getting his ears gnawed off by a robot mouse, which caused him to slip into depression on top of a tower, where he drank a potion labelled "sadness" and as he wept, the yellow color was washed off and his voice changed due to the potion. These events are what caused Doraemon to have such a huge fear of mice, despite the fact he's actually a robot cat and these events were also animated into a 2005 intro to the current anime series.

Doraemon (Blue Ball) also has a fourth-dimensional pocket on his body from which he can acquire various colourful, awesome and futuristic gadgets, tools and playthings from a future department store, mostly each one he acquires in each story are to help out Nobita Nobi with anything he has trouble with in the story. He also has the tendency to panic during emergencies, characterized by him frantically trying to pull out a very much-needed tool from his pocket, only to produce a huge assortment of unrelated household items, which are quite irritating at times.

Doraemon's favorite food is Dorayaki. He also like to eat a watermelon, a pudding, and various cakes. He gets angry when anyone tries to eat Dorayaki (he calls it as Dora cake) without offering him one...

Source:Wikia