Arkham Asylum patients

• 
  Abattoir
• 
  Amadeus Arkham
• 
  Amygdala
• 
  Anchoress
• 
  The Architect
• 
  Jeremiah Arkham

• 
  Bane
• 
  Batman (Brane Taylor)
• 
  Big Top
• 
  Black Mask
• 
  Blockbuster (Telltale)

• 
  Calendar Man
• 
  Clayface (Basil Karlo)
• 
  Clayface (Cassius Payne)
• 
  Clayface (Matthew Hagen)
• 
  Clayface (Preston Payne)
• 
  Cornelius Stirk
• 
  Crazy Quilt

• 
  Doctor Phosphorus
• 
  Doodlebug
• Dora Smithy (DC Animated Universe)

• 
  Egghead

• 
  Alberto Falcone
• 
  Firefly
• 
  Firefly (Ted Carson)
• 
  Flamingo
• 
  Mr. Freeze (Arnold Schwarzenegger)
• 
  Fright

• 
  Gaggy
• 
  James Gordon, Jr.
• 
  Great White Shark
• 
  Solomon Grundy

• 
  Harley Quinn
• 
  Humpty Dumpty
• 
  Hush

• 
  Impostor Mad Hatter

• 
  Jane Doe
• 
  The Joker
• 
  The Joker (Telltale)
• Josephus Quigona
• 
  Junkyard Dog

• 
  Killer Croc
• 
  Killer Moth
• 
  Kite Man

• List of Former Members of The Outsiders
• 
  Lock-Up
• 
  Lunkhead

• 
  Mad Hatter
• The "Made Of Wood" Killer
• 
  Magpie
• 
  Man-Bat
• 
  Marian Drews
• 
  Martin "Mad Dog" Hawkins
• 
  Merrymaker
• 
  Mime
• 
  The Mortician
• 
  Mr. Freeze

• 
  The Penguin
• 
  Penny Plunderer
• 
  Phosphorus Rex
• 
  Poison Ivy
• 
  Poison Ivy (Uma Thurman)
• 
  Professor Milo
• 
  Professor Pyg
• 
  Prometheus

• 
  Ratcatcher
• 
  The Riddler
• 
  The Riddler (Jim Carrey)

• 
  Scarecrow
• 
  Alyce Sinner
• 
  Spook
• 
  Hugo Strange

• 
  Tally Man II
• 
  The Mad Dog
• 
  The Ventriloquist
• 
  Thomas Schiff
• 
  Jason Todd
• 
  Tweedledee
• 
  Tweedledum
• 
  Two-Face
• 
  Two-Face (Burtonverse)

• 
  The Ventriloquist (Peyton Riley)
• 
  Victor Zsasz
• 
  Victor Zsasz (Tim Booth)

• 
  Arnold Wesker (Telltale)

• 
  Maxie Zeus
• 
  Victor Zsasz (Telltale)