Doraemon

Here are some of his tools:
Takekoputa: small propellers
When people put them on their heads, they can fly freely. It seems that the structure of the propeller is very simple, but is not well known. Using a propeller, you can fly 600 kikometers at 80 kilometers per hour, like flying from Tokyo to Osaka in seven and a half hours.

Taimu-mashin: the time machine
Doraemon and his friends can use the door to go into the future or the past. They can even decide when and where they will go. However, they don't always end up where they planned. The entrance and exit to the time machine is in Nobita's desk.

Dokodemo-doa: everywhere door
If they open this door and say the name of the place they wish to go, they will go there as they pass through it. But the door looks like an old weak wooden door , once it was even thrown out with the trash. But it is so convenient, I am sure modern businessmen/women would love to have one.
Small Light
It looks like a flashlight. They flash the light at someone or something to make them small. Usually the light is used to defeat enemies. The light has limited range so it is not always useful.
Taimu-furoshiki: Time wrapping cloth
It looks like an ordinary wrapping cloth, but has great power. It has two sides, but its effect depends on which side you touch things with. On one side any item you touch the cloth to will become newer, and the other side will make an object older. If you put the wrapping cloth on persons, they will become younger or older only in their appearance.
Sewayaki-roupu: the helping rope
It can change itself to anything. It may stroke Nobita's head, pay newpaper bills, be a horse, fly in the sky as an airplane or be an umbrella when it's rainy. The only thing that it can't do is speak. It communicates its with sign language.
Moshimo-bokkus: The "if" box
It just looks like a telephone box (booth). If they say "***** world, please" to the receiver and exit the box, the world changes to what they said. The world ends when they say "Please go back" to the box. So they can't go back when the box is broken.
Mad Watch
If they use the watch, only they can move while time stops for everything/everyone else.

Here are some tools in Doraemon's pocket that are not as useful as those shown above:
Sasuto-amegafuru-kasa: raining umbrella
If they open the umbrella, it rains only under the umbrella. This can be useful when you need it to rain.
Kenka-tebukuro: the fight gloves
They are similar to boxing gloves. If you wear them, you begin to strike your own face and fight wth yourself.