In case the question is not very clear, What I want to know is:

  • What Dende or Kami must do as the Guardian of Earth?
  • Do they have to protect human being from evil?
  • Do they have to create the dragon balls?
  • Do they have to hear and grant (if appropriate) any humans wish (as the comment said they referenced as God)?
  • Do they have to watch over every activity that people on earth do?
  • If they don't have to create dragon balls, do they have to be from Namek?
  • Aside from people safety, in what problems they may or must help humans for fulfilling their job as Guardian of Earth?

Basically, the question is what are their tasks as the Guardian of Earth?

  • 1
    Because of the dragon balls, you know..
    – Happy Face
    Feb 23 '16 at 9:17
  • Do you mean what in the Dragonball universe is refered as god on earth?
    – xerido
    Feb 23 '16 at 9:32
  • Well, I don't think the question is very clear. I think you should make it more clear by editing in what exactly you want to know about that, and why it may be important.
    – Hakase
    Feb 23 '16 at 9:51
  • 1
    @Hakase updated. added some details.
    – Mas Bagol
    Feb 23 '16 at 10:14
  • 2
    @MasBagol: To make sure that you get satisfactory answer for your questions, it's best to split them up into multiple questions, if they are not closely related. Otherwise, people will just post an answer to one of those questions without addressing others. For example, "do they have to be from Namek?" worth its own question and should be post separately.
    – nhahtdh
    Feb 23 '16 at 10:38

As is mentioned on the wikia site,

Guardian (神様, Kami-sama; lit. "God") is the title given to the individual protectors of planets in the Dragon Ball series.

Despite their names, the Guardians' role is closer to that of an overseer.

As the Guardian of Earth (I will be using GE as an abbreviation), Kami or Dende have to protect the human beings from evil. A few examples being

  • Kami training Goku during the Piccolo Jr. Saga.
  • Kami training the other Z Warriors during the Saiyan Saga.
  • Kami and Mr. Popo spreading the Sacred Water throughout the entire world using the Seven Air Currents located inside Kami's Lookout in order to cure the Earthlings from the effects of Garlic Jr.'s Black Water Mist.

To expand a bit more on their job,

Guardians have an indirect reporting relationship to one of the Kais (in the case of the Guardian of Earth, this is King Kai).

Another way of looking at this is that Guardians are more supervisors than they are managers.

They have many of the powers associated with Gods, including the ability to see and sense events around the world, to travel to and guide souls to Other World, and to be a general protector of the people.

This concludes the tasks of the GE.

Now to answer your other questions,

  • The GE doesn't necessarily have to be from Namek. The reference being that
    • Kami was the first Namekian GE.
    • Kami asks Goku to replace him as the GE after the World Martial Arts Tournament in Piccolo Jr. Saga.
  • As the GE doesn't have to be Namekian, they don't have to create the dragon balls.
  • They do grant human wishes if they are appropriate. An example being when he gave a new life to Shenron on Goku's demand after he was destroyed by King Piccolo.

I believe this answers all your questions...

  • well much better than mine that is clear +1
    – xerido
    Feb 24 '16 at 12:08
  • @xerido Thanks. As a matter of fact, your answer is good too... Feb 24 '16 at 12:15

In the anime and the manga the guardian of earth functions are more of a supervisors than actual defender (had to search up for this).

They normaly report the state of the earth to one of the Kais. They don't directly mend with human activities and are more concerned with other tasks, like mantaining the varius portals that exist where they live.

Now to the rest of the questions regarding namekians:

  • No they don't have to be namekian, Kami was the first namekian Guardian, before he was named kami he was the nameless namekian. to become kami ( or the guardian), he had to cast out all the evil inside him that is what becomes piccolo.

  • They don't create the dragonballs, they didn't existed until kami came to earth, because dragonballs are a namekian creation of a specific cast.

  • Dende became the new guardian after kami because kami fused with piccolo jr and the dragon balls stoped to work, dende is of the special cast of namekians that can create dragonballs, he even empowered them after restoring them making him able to grant two wishes instead of one

Source: http://dragonball.wikia.com/wiki/Guardian

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