Introduced in Omniverse

• 
  Alien Kid
• 
  Aloysius Animo (Future)/Omniverse
• 
  Alton Alabaster
• 
  Professor Aniceto
• 
  Anur-Mirrored Ben
• 
  Anur-Mirrored Charmcaster
• 
  Anur-Mirrored Hobble
• 
  Anur-Mirrored Rook
• 
  Argit (Future)
• 
  Azmuth (Dimension 23)

• 
  B.L.R.R.T.
• 
  Bad Ben
• 
  Bahrvad
• 
  Ben 10,000 (Omniverse)
• 
  Ben Tennyson (Dimension 23)
• 
  Benevelon
• 
  Benzarro
• 
  Bezel
• 
  Bill Gacks
• 
  Billy Billions (Classic)
• 
  Blarney T. Hokestar
• 
  Blue-Worst
• 
  Blukic
• 
  Bouncers
• 
  Bromeba
• 
  Private Brownbag
• 
  Bryk
• 
  Bubble Helmet

• 
  Caitiff
• 
  Sergeant Cast Iron
• 
  Chadzmuth
• 
  Charles Zenith
• 
  Chicken Alien
• 
  Chortle
• 
  Chupacabra
• 
  Clyde Fife
• 
  Collectimus
• 
  Contemelia
• 
  Sergeant Cookmeister
• 
  Corvo
• 
  Cow Alien
• 
  Crüjo

• 
  Deefus Veeblepister
• 
  DJ
• 
  Dr. Psychobos
• 
  Driba
• 
  Duffy

• 
  E-N
• 
  Ectonurite Twins
• 
  Eighteight
• 
  Elliot
• 
  Ester

• 
  Fergi
• 
  Fistina
• 
  Fistrick
• 
  Fistrick's Thug

• 
  Galactic Gladiator
• 
  Galvan Major
• 
  Gar Red Wind
• 
  George Washington
• 
  Gil Steptoe
• 
  Major Glorff
• 
  Green-Worst
• 
  Grick and Grack
• 
  Gwen Tennyson (Gwen 10 Timeline)
• 
  Gwendolyn Tennyson (Omniverse)

• 
  Helena Xagliv
• 
  Hervé
• 
  Hobble
• 
  Hooded Alien
• 
  Hoodlum
• 
  Hulex Colonel
• 
  Hulex Workers
• 
  Hypnotick

• 
  Isosceles Right Triangle Vreedle

• 
  J. Jonah Jones
• 
  Jerry
• 
  Jonesy
• 
  Julius

• 
  K8-E
• 
  Kai Green (Future)
• 
  Ken Tennyson (Omniverse)
• 
  Kevin Levin (Future)/Omniverse
• 
  Khyber
• 
  Khyber's Panuncian
• 
  Captain Kork
• 
  Krakken/Omniverse
• 
  Kundo
• 
  Kuphulu
• 
  Kyle Monitor

• 
  Lackno
• 
  Leadfoot
• 
  Leander
• 
  Lepidopterran Kid
• 
  Liam
• 
  Lillimusha DiForestini
• 
  Looma Red Wind
• 
  Loovis Slerdlerk
• 
  Lord Transyl
• 
  Luhley

• 
  Mad Ben
• 
  Mad Harangue
• 
  Mad Pakmar
• 
  Mad Rook
• 
  Madison
• 
  Madison's Father
• 
  Magister Arnux
• 
  Magistrata
• 
  Malice
• 
  Maltruant
• 
  Malware
• 
  Margie
• 
  Max Tennyson (Future)/Omniverse
• 
  Max Tennyson (No Watch Timeline)
• 
  Mazuma
• 
  Medic
• 
  Mino-Toga
• 
  ML-E
• 
  ML-E's Mother
• 
  Molly Gunther
• 
  Morty
• 
  Mutant Ants
• 
  Mutant Giraffe
• 
  Mutant Kangaroo
• 
  Mutant Mosquito
• 
  Mutant Snail
• 
  Mutant Squirrels
• 
  Mutant To'kustars

• 
  N-8
• 
  N-D
• 
  Natalie Alvarez
• 
  Nega Ben
• 
  No Watch Ben
• 
  Nyancy Chan

• 
  Orange Offenders
• 
  Orange-Worst
• 
  Otto

• 
  Pakmar
• 
  Parallelogram Vreedle
• 
  Parts Dealer
• 
  Pax
• 
  Pink-Worst
• 
  Poltroon
• 
  Purple-Worst
• 
  Pyxi

• 
  Rad Dudesman
• 
  Lieutenant Rana
• 
  Rayona
• 
  Ripjaws (Classic)
• 
  Robucket
• 
  Rook Ben
• 
  Rook Blonko
• 
  Rook Blonko (Future)
• 
  Rook Bralla
• 
  Rook Da
• 
  Rook Shar
• 
  Rook Shi
• 
  Rook Shim

• 
  Scout
• Category:Secret Saturdays Characters
• 
  Seebik
• 
  Servantis
• 
  She-Worst
• 
  Sheelane
• 
  Sheriff Wat-Senn
• 
  Skurd
• 
  Slim-Worst
• 
  Smoothy Vendor
• 
  Smuggled Psycholeopterran
• 
  Sock Vendor
• 
  Solid Plugg
• 
  Squid Monsters
• 
  Starbeard
• 
  Stick Doug
• 
  Subdora
• 
  Suemungousaur
• 
  Sweet-Eels Sparklefunk
• 
  Swift

• 
  Technobug
• 
  Tentacle Vendor
• 
  Tetramand Priest
• 
  Tetrax Shard (Dimension 23)
• 
  Thaddeus J. Collins
• 
  Thunderpig
• 
  Time Beast
• 
  Toby Monitor
• 
  Tummyhead
• 
  Twin Knights
• 
  Twotwo

• 
  Ujin

• 
  Vexx
• 
  Viktoria
• 
  Violet Offenders
• 
  Violet-Worst
• 
  Queen Voratia Rumbletum

• 
  Walt
• 
  Wolf Blitzer

• 
  Y-it
• 
  Yetta

• 
  Zed