Ben Tennyson

Benjamin Kirby"Ben" Tennyson, also known as Ben 10 is the wielder of the Ultimatrix. The Ultimatrix shapeshifting abilities allow Ben to become Alien X, a Celestialsapien.He is actually 1/4 Anodite and 3/4 Human.

Powers
Ben wields the Ultimatrix (originally omnitrix) which give him shapeshifting powers that let him turn into any alien he wants, as long as they are in the Codon Stream.

Weaknesses
He can only turn into a alien when the Ultimatrix is charged. When he wielded the Omnitrix, Ben twists the dial to transform. This weakness was cured when Ben got the Ultimatrix.