Gohan

Gohan is basically the root of Dragon Ball Z, the whole story basically revolves around him, I can't think of 1 episode that he isn't in. Gohan is Goku and Chi-Chi's son. Gohan has the ability to turn Super Saiyan like Goku, Trunks, Goten, and Vegeta. Gohan has always had great power in him. That power helped Piccolo and Goku defeat Radditz. In his early life, (Deadzone and Radditz mainly) when his power was used. he never remembered that he used it. When he ever gets angry, his power increases a lot, that is how he hit Radditz, and knocked Garlic Jr. into the Deadzone. His anger basically drives his power. Like all Saiyans he has the ability to transform into a Giant Monkey-like being. This multiplies a Saiyan's power by 10, so his early power level of 1,307 would become 13,070. Gohan transformed 4 times from what I can remember (I only have the American Version and Japanese, but we aren't far in the Japanese.) The first time he transformed was when Piccolo left him out in the open, Piccolo had to destroy the moon for him to revert. The second time was when Piccolo was training him, he was asleep, but woke up. A fake moon caused Gohan to become partially transformed therefore he had a real craving to fight. Then he transformed when Piccolo tried to contain him. The third time was during the battle against Vegeta. Vegeta had transformed and Yajirobe cut off his tail. Vegeta's Moon Burst (in America) had still remained and that caused Gohan to transform. This was a deciding factor in the battle. The fourth time was in the movie Tree of Might. Taurus (Turles in America) had used the same move to purposely transform Gohan. Gohan had a so much of a friendship with Icarus (Haiya Dragon in Japan, and in most other languages) that Gohan didn't have the anger and will to fight. Taurus almost killed Icarus and caused Gohan's anger and will to fight surface. Gohan was a valuable asset on Namek too. His power was great, but still not enough. He and Krillin easily defeated 2 of Freeza's goons, but Dodoria was a problem. After seeing Guru (Saichouruu) Gohan's power raised to 22,000. (It is not to be confused with the 14,000 you may see. 22,000 is the correct power.) Gohan's new power still wasn't even enough to defeat Recoome. Gohan makes an attempt to attack Freeza, and manages to get 1 Masenko out and knock Freeza. Freeza goes to 100% again, but before he could attack, Goku is back. On Earth Mr. Popo collected the Dragon Balls and all the Nameks and Vegeta were wished back to life. Dende wishes everyone but Freeza and Goku back to Earth. A battle begins against Gohan and Vegeta, but it winds up getting broken up by Piccolo. Gohan, Krillin, and Piccolo also had to fight Garlic Jr. again. Gohan fought very well and managed to damage Garlic Jr. Gohan punched a hole through him, and did some very nice handiwork. Gohan probably would've killed him, but Garlic Jr. was given immortality by the Dragon Balls. Gohan is the one who winds up sending him back into the Deadzone, TWICE.