Gohan

Gohan starts out the as a big nerdy wuss but when Raditzu comes he gets angry in a big way and his power shoots up to beyond even his father Goku after Raditzu and Goku are dead Piccolo has seen the boys power and decides to train him he is left in the dessert and at first he goes around hungry and lonely eventually he gets the hang of it and finishes the training he runs from Vegeta at the start but later comes back and helps finish Vegeta. He later marries Videl (Mr. Satan's daughter). He is the first to reach ss2 thus making him the most powerful for a time.

 

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Power Levels

during the fight with Raditzu="1 to 1,307"
right before the fight with Vegeta and Nappa="981"
during the fight with Vegeta and Nappa="2,800"
max power level on Nameck="14,000"