Rex Tennyson

Rex Tennyson is the son of Ben or should I say 'MetaBen' and star of the series T-Rex: A New Generation.

Appearance
He looks slightly similar to 10 year old Ben, but he's got black eyes and wears a blue shirt, black pants and a blue omnitrix.

Personality
Rex is Ben's first son and is also very much like his dad at that age, though maybe not as immature. Rex takes great pride in his father being the most powerful being in the universe, but he knows the limitations to his pride.

He also has a natural leadership attitude, due to him being a first-born. He is also very heroic, another trait displayed by his father at his young age.

Powers and Abilities
At the age of 10, MetaBen as a present, forged an omnitrix for Rex. This gift further angered Azmuth, but Ben says he should trust him on this.

With this omnitrix, Rex decides to help his father combat the new generation of villians. Even though MetaBen had it way under control, he decided to even the playing field and sit back and relax, only interferring when the universe or at least a galaxy was at stake and if Rex and his crew couldn't handle it.

Rex's omnitrix gives him the ability to transform into 20 aliens at the start of the series, but it is confirmed that new aliens will soon start rolling in starting from season 2.

The aliens he has at first are:

Upgrade

Diamondhead

Humongousaur

Echo Echo

Heatblast

Jetray

Fasttrack

Big Chill

Cannonbolt

Water Hazard

Brainstorm

Lodestar

Atomix

Terraspin

NRG

AmpFibian

Armodrillo

Nanomech

Swampfire

Way Big

He also has some magic skills, being trained under the family friend, Charmcaster.