A list of all characters and alien species that have appeared in the Ben 10 franchise.
Main
- Ben Tennyson
- Ben 10,000
- Ben 23
- Bad Ben
- Mad Ben
- Nega Ben
- Gwen Tennyson
- Gwen Tennyson (Future)
- Lucky Girl (Ben 10)
- Julie Yamamoto
- Kevin Levin
- Kevin 11 (Ben 10)
- Kevin 11,000
- Ultimate Kevin
- Max Tennyson
- Rook Blonko
Alien Transformations
Introduced in the Original Series
- Arctiguana
- Blitzwolfer (Benwolf)
- Buzzshock
- Cannonbolt
- Diamondhead
- Ditto (Ben 10)
- Eye Guy
- Four Arms (Ben 10)
- Frankenstrike (Benvicktor)
- Ghostfreak
- Grey Matter (Ben 10)
- Heatblast
- Perk Upchuck
- Ripjaws
- Snare-Oh (Benmummy)
- Spitter (Ben 10)
- Stinkfly
- Upgrade (Ben 10)
- Way Big (Ben 10: Secret of the Omnitrix)
- Wildmutt
- Wildvine
- XLR8
Introduced in Ben 10: Alien Force
- Alien X (Ben 10)
- Bellicus
- Serena (Ben 10)
- Big Chill
- Brainstorm (Ben 10)
- Chromastone
- Echo Echo (Ben 10)
- Goop (Ben 10)
- Humungousaur
- Jetray
- Lodestar (Ben 10)
- Murk Upchuck
- Nanomech (Ben 10) (Ben 10: Alien Swarm)
- Rath (Ben 10)
- Spidermonkey
- Swampfire
Introduced in Ben 10: Ultimate Alien
- Ampfibian (Ben 10)
- Armodrillo
- Chamalien
- Clockwork (Ben 10)
- Eatle (Ben 10)
- Fasttrack (Ben 10)
- Juryrigg
- NRG (Ben 10)
- Shocksquatch (Ben 10/Generator Rex: Heroes United)
- Terraspin
- Ultimate Big Chill
- Ultimate Cannonbolt
- Ultimate Echo Echo
- Ultimate Humungousaur
- Ultimate Spidermonkey
- Ultimate Swampfire
- Ultimate Wildmutt
- Waterhazard (Ben 10)
- Ultimate Way Big
Introduced in Ben 10: Omniverse
- Astrodactyl
- Atomix (Ben 10)
- Ball Weevil (Ben 10)
- Bloxx
- Bullfrag (Ben 10)
- Crashhopper
- Feedback (Ben 10)
- Gravattack
- Ultimate Gravattack
- Gutrot
- Kickin' Hawk
- Mole-Stache
- Pesky Dust
- The Worst
- Toepick
- Ultimate Arctiguana
- Ultimate Rath
- Walkatrout
- Whampire
Introduced in Ben 10 (2016)
- Gax
- Overflow
- Shock Rock
- Slapback
- Surge
Recurring
- Acid Breath
- Aggregor
- Albedo (Ben 10)
- Ultimate Albedo (Ben 10)
- Argit
- Attea (Ben 10)
- Billy Billions
- Captain Nemesis
- Charmcaster
- Dr. Animo
- Ester (Ben 10)
- Frightwig
- Helen Wheels
- Hex (Ben 10)
- Kangaroo Kommando
- Ken Tennyson
- Khyber (Ben 10)
- Looma Red Wind (Ben 10)
- Lucy Mann
- Malware (Ben 10)
- Michael Morningstar
- Red Knight (Ben 10)
- Reinrassig III
- Rojo (Ben 10)
- Rook Shar
- Ship (Ben 10)
- Sir Driscoll
- Skurd (Ben 10)
- Sunder (Ben 10)
- Sublimino
- Tetrax
- Thumbskull
- Vilgax
- Zs'Skayr
Minor
- Camille Mann
- Clancy (Ben 10)
- Decoy Queen (Ben 10)
- Devlin Levin
- Dr. Victor Valadis
- Eunice (Ben 10)
- Jarret (Ben 10)
- Mazuma (Ben 10)
- P'Andor (Ben 10)
- Prince Of Lewoda (Ben 10)
- Sugilite (Ben 10)
- Turbine (Ben 10)
- Xylene
Alien species
- Anodite
- Appoplexian
- Arburian Pelarota
- Celestialsapien
- Crystalsapien
- DNAliens
- Ectonurite
- Galvan
- Galvanic Mechamorph
- Highbreed (Ben 10)
- Incursean
- Kineceleran
- Lenopan
- Lucubra
- Nosedeenian
- Microchips (Ben 10)
- Mutant Frogs
- Necrofriggian
- Petrosapien
- Pickaxe Alien (Ben 10)s
- Piscciss Volann
- Tetramand
- Rock Monsters (Ben 10)
- To'Kustar
- Vulpimancer
- Way Bads