Ben 10: Omnitrix Master/Characters

Main Heroes
Ben Tennyson

Gwen Tennyson

Kevin Levin

Rook Blonko

Recurring Heroes
Most of the characters in OS, AF/UA, and OV

B.T Manfan

Maniac Manfan

Flashdance Manfan

Cashew Manfan

Ben 33

In the Video Games
Pak-Mar

Fasttrack the Cheetah

Villains
Same as OV except Zed

Khyber's New Pet

Xenobreed

The Rogue Xenocytes

Ben 17

In the Omnitrix 2.0
All Canon Aliens with the Ultimate Forms (including the canon Ultimate Grey Matter), Combos, Buzzshock, Spittor, Snakepit, Shellhead, Atomix, and Portaler

Green Needle

Grave Guard

Computer Dude

Mana Power

Earthformer

Way Ben

XLRFreak

Swampchill

Heatchuck

In the Negatrix (Albedo's Omnitrix)
All Ultimates (including Ultimate Grey Matter)

Grey Matter

Wildvine

Big Chill

Snare - Oh

Goop

Swampfire

Spidermonkey

Echo Echo

Cannonbolt

Wildmutt

Way Big

Rath

Jetray

Fasttrack

NRG

Diamondhead

Brainstorm

ChamAlien

Blitzwolfer

Frankenstrike

In the Nemetrix
All canon ones

Hesitate

Chipwhale

Sponge Clone

Tyrannostarus Rex

Crashcrab

Shark Tree

NCLR

Stardinal

In the Hero Watch
Characoal - Man

Freezelizard

Eye Guy

Mr. Monkey

Vomit-Man

Giant-Manster

Feedback

Dog-Nabbit

Rollaway

Electricyeti

Pullanet

Portaler

Lego Guy

Mr. Mole

Mr. Mummy

Loudog

Stormstien

Cat Split

Jellytric

Spewfish

Diggy Diggy Duse

Mad Cat

The 23rd Alien

In the Villitrix
Large Laser

Iceguana

Lego Ape

Lagoon Flame

Angry Tiger

Techno Guy

Shardshot

Cat Ameboa

Tick Clock

Energy Barf

Electrodude

Tomb Dust

Sonic Canine

Ice Cold

Goop

Smartofibian

Spider Monkey

In Ben 33's Omnitrix
Sarcopharoah

Yelling Mutt

Electrostien