Ending Story of Doraemon

There are two current and often quoted urban legends that started spreading in late 1990s of an ending to the Doraemon series.

I like the first one...second sound so pathetic...and the third sound...lame...

The first and the more optimistic ending was made public by Nobuo Sato several years ago. Doraemon's battery power ran out, and Nobita was given a choice between replacing the battery inside a frozen Doraemon, which would cause it to reset and lose all memory, or await a competent robotics technician who would be able to resurrect the cat-robot one day. Nobita swore that every day to work hard in school, graduate with honours, and become that robotics technician. He successfully resurrected Doraemon in the future as a robotics professor, became successful as an AI developer, and thus lived happily ever after, thus relieving his progeny of the financial burdens that caused Doraemon to be sent to his space-time in the first place.

The second, more pessimistic ending suggests that Nobita Nobi is suffering from autism and that all the characters (including Doraemon) are simply fictional characters in his imagination. (This ending is actually the ending for the series St. Elsewhere, which ended in 1988.) The idea that Nobita was a sick and dying little boy who imagined the entire series on his sickbed to help him ease his pain and depression no doubt angered quite a bit of fans. Many Japanese fans staged a protest outside the Head Quarter of the publisher of the series after learning about this suggestion. The publisher had to issue a public statement that this is not true.

The third ending suggests that Nobita fell and hit his head on a rock. He fell into deep coma, and eventually into a semi-vegetative state. To raise money for an operation to save Nobita, Doraemon sold all his tools and devices in his four-dimensional pocket. However, the operation failed. Doraemon sold all his tools except for one used for the last resort. He used it to enable Nobita to go wherever he wanted, whichever time era he wished to go. In the end, the very place Nobita wanted to go is heaven...

-source from Wikipedia