Credits to Wolf for the Ben
Ben 10 vs. Ash Ketchum
Information on the RapperEditBenjamin "Ben" Kirby Tennyson is the main protagonist of the series. He is a 10-years old (15 in Alien Force, 16 in Ultimate Alien and Omniverse) child from Bellwood, who found the Omnitrix during his summer vacation with his grandfather Max and his cousin Gwen. The watch fastens on his wrist and gives him the incredible power and ability to transform into super-powered aliens, and then he uses his new powers and abilities to become a superhero, dealing with both earth and aliens threats, while trying to escape the alien warlord Vilgax, who pursue him relentlessly in order to retrieve the Omnitrix. For most of time, Ben is portrayed as mostly immature, sometimes self-centered boy; in the beginning, he only helped people with the pleasure of being a hero. This leads Gwen, Max, and the others to doubt Ben and they wonder if he has what it takes to be a hero and he should keep the Omnitrix. He has matured dramatically and is a very capable good leader in the sequel Ben 10: Alien Force due to Grandpa Max's disappearance and the threat of the Highbreed Invasion, but tends to relax and (somewhat) turn back to his original self in the third season. Despite his immaturity, Ben's actions are motivated above all by a strong and sincere will to help other people; he'll stop at nothing to protect his family or anyone in danger. Sometimes, his idealistic nature tends to make him act naive. Though often thought by many other characters to be quite unintelligent, Ben actually proves to be resourceful and cunning when needed, usually showing good adaptation skills when the Omnitrix doesn't provide him with the form he originally wanted.
It's Hero Time!
I'm kicking this 10 year old's butt with my alien rhymes!
You think you'll be the greatest Pokémon master?
Ha! You look like something out of Animo's disasters.
Gary Oak gets 7 times more Pokémon than you do.
I'll go Diamondhead and trap you in rock like Mewtwo.
I'm a teenager now, and I got a new Omnitrix.
I don't wanna get bored with your little mouse's electronic tricks.
[Ben presses the Omnitrix again and becomes Diamondhead]