Benjamin "Ben" Kirby Tennyson is the main protagonist of the Ben 10 franchise. He was a normal 10 year old kid, until he found the Omnitrix that let him transform into ten different alien forms.
In the series Edit
In the series Ben first appears as Heatblast to assist Jake, Knuckles, and the rest of the team. He stopped the rest of the Symbiotes with Echo Echo.
He, like Knuckles had a hard time trusting Lea when he joined the team, but grew to think of Lea as a teammate and friend.
He can still be cocky at time, but he is still loyal to his friends and respects Jake as a leader.
Aliens used so far