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Shenron was origanally made from Kami, and his orbs were just the 1-Star Dragonball. There is another Shenron known as Dark Shenron. Anyways, Shenron was made to grant any one wish each time he's summoned. The wishes that Shenron has granted throughout the Dragonball series were (in no particular order):

• Turn Goku into a child
• Women's underpants
• King Piccolo's youth
• Lord Slug's youth
• Goku's revival
• Revive Frieza's victims
• Krillin's revival
• Master Roshi's revival
• Revive Cell's victims
• Remove the bombs from the androids
• Revive Vegeta's victims
• Erase the world's mind of Majin Buu
• Revive Super Hell Fighter 17's victims

(In Dr. Slump, he granted a wish for a tractor for the Penguin Village.)

Shenron obeys only to the wishes that were made. Unlike Dark Shenron, he cannot just do something out of Kami or Dende's power. Shenron scatters the Dragonballs in 7 spots around the Earth for where they remain dormant for one year.

In Dragon Ball GT, Shenron was trapped in 7 cracked Dragonballs, and when the Z Force summoned him, the Shenron that Dende watched over turned out to be a huge blue, cigar smoking dragon with torn wings. He tells the fighters that no more wishes will be made because he didn't want to grant them. He also said that the positive wishes reacted badly on him through out the series. He then takes off and splits to 7 different dragons, and Goku along with his grandaughter, Pan go and fight the dragons.

The only female dragon was Oto Shenron. This Shenron is in human form and was made through Oolong's wish. After six of the cracked dragon balls were turned back to normal, the last dragon that Goku had to fight consumed the dragons balls, bringing him to full power. This Shenron was tougher than Goku and Vegeta in their SS4 modes.

During the fight Shenron tries to wipe out all life in the universe. But fourtune had it that SS4 Gogeta stopped the darn dragon. The Shenron that was in the DBZ seres returns, only to grant one wish and sleep for 100 years. Shenron granted the wish to revive people and fly with Goku to the center of the Earth to sleep.