Characters who appeared in The Meltdown

• 
  Albert Sandy
• Anthony Denard

• 
  Baby Gibson
• Becky Cosgrove

• 
  Cassie Drench

• David Marsh
• 
  Dennis Tracton
• Dougie Finch

• Emilia Greenwall
• Eric Reynolds
• 
  Ernesto Gutierrez
• Evelyn Trimble

• 
  Fake Greg Heffley
• 
  Frank Heffley
• 
  Fregley

• 
  Gabriel Johns
• 
  Gary (weatherman)
• 
  Gino
• 
  Gramma
• 
  Great Aunt Dorothy
• 
  Greg Heffley

• Jacob Hoff
• 
  Jake McGough
• Jameson Garza
• Jeremy Garza
• 
  Joseph O'Rourke

• Latricia Hooks
• 
  Lily Bodner

• 
  Manny Heffley
• Marcus Marconi
• Marlee Sisters
• 
  Meckley Mingo
• 
  Mingo Kids
• 
  Mitchell Pickett
• 
  Mr. Morsels
• Mr. Yee
• Mrs. Drummond
• Mrs. Jimenez
• Mrs. McNeil
• Mrs. Willey

• 
  Night Janitor

• 
  Pervis Gentry

• 
  Robert
• 
  Rodrick Heffley
• 
  Rowley Jefferson

• 
  Safety Patrol
• Shane Browning
• Sheldon Reyes
• 
  Speed Bump
• 
  Susan Heffley
• 
  Sweetie

• Teddy Silvetti
• 
  The Heffleys' Pig
• Trevor Nix

• Victoria Hooks

• 
  Whirley Street Kids