Justin is a male toon dog. He has brown fur with a lighter shade of brown on his belly, blue eyes, floppy ears, and a round red nose. He also has four fingers (like most cartoon characters) and three toes.
Age: 12-14 (His age stops at 14, and stays like that forever, as if his life is on a floating timeline.)
Most of the time, Justin is a happy-go-lucky puppy dog who is somewhat carefree. He acts like he is Dennis's half-blood brother. However, Justin can act childish at times, but he does care for his friends very much.
Deviantart Friends: DuskHusky64 (Dusk the Wolf), Kylgrv, ShiftyInfinity, Mariolover54321, Richard-Devil, JimmyCartoonist, CherryFungi, EnhancedToon, Conlimic000, TheTrans4master, Paulasocar, and more.
Other Friends (This is a very long list.): Dennis, Simon the Puppy, Luna the Dragon, Lenny Kangaroo, Molly Kangaroo, Augie Dingo, Maralyn Koopa, Bugsly Kitten, Rufus the Dog, Rayman (character), Bubsy Bobcat, Max Goof, Dotty Dog, PJ Pete, Danny Fenton/Phantom, Sam Manson, Tucker Foley, Jazz Fenton, Maddie & Jack Fenton, Cujo the Ghost Dog, Wulf, Frostbite, Clockwork, Princess Dorathea the Ghost Dragon, Bonnie the Bunny, Foxy the Pirate, Montgomery Moose, Woolma Lamb, Zipper Cat, Portia Porcupine, Bingo Beaver, Peanut Otter, Butter Otter, Jelly Otter (sometimes), Pinch Raccoon, Munchy Beaver, Flick Duck, Champ Raccoon, Dibsy Wolf, Scootch Raccoon, Opal and Ernest Otter, Lewie Snootie, Buster Bunny, Plucky Duck, Hamton J. Pig, Little Beeper, Furrball the Cat, Calamity Coyote, Dizzy Devil, Babs Bunny, Fifi la Fume, Shirley the Loon, Gogo Dodo, Yoshi, Scooby Doo, Scooby Jr., Oggy the Cat, Olivia, Jack, Timothy Raccoon, Yoko the Cat, Nora the Mouse, Charles the Mouse, Lilly the Fox, Doris the Beaver, Claude Raccoon, Fritz the Skunk, Grace the Cat, Frank 1 and Frank 2, Mrs. Jenkins, Bumblelion, Butterbear, Eleroo, Hoppopotamus, Rhinokey, Moosel, Patty Rabbit, Bobby Bear, Danny Dog, Roxie Raccoon, Suzie Squirrel, Fanny Fox, Rachel Rabbit, Miss Deer, Roobear Koala, Laura Koala, Floppy Rabbit, Mimi Rabbit, Nick Penguin, Pamie Penguin, Kiwi, Mingle, Weather, Preston Evergreen, Rusty Wildwood, Grover Chestnut, Ashley Evergreen, Party Popple, P.C. Popple, Pancake Popple, Puzzle Popple, Puffball Popple, Prize Popple, Putter Popple, Pretty Bit Popple, Potato Chip Popple, Bonnie and Billy Wagner, Ovide Platypus, Matilda the Kangaroo, Banjo, Kazooie, Phineas Flynn, Ferb Fletcher, Perry the Platypus/Agent P, The Teen Titans, Cassie the Dragon, Ord, Zak & Wheezy, Blue the Dog (Blue's Clues), Harchi Hyena, Popy the Fox, Buck the Vulture, Oscar the Lizard, Skippy Kangaroo, Kangaroo Jack, Flippy Doggenbottom, Zippy & Gwen Doggenbottom, Bert Raccoon, Ralph & Melissa Raccoon, Lisa Raccoon, Blinky Bill, Nutsy Koala, Flap the Platypus, Splodge Kangaroo, Marcia Mouse, Shifty Dingo, Daisy Dingo, Andy Electoon, Misty Electoon, Mub and Grub, Ollie Gator, Lily the Frog, Tad the Frog, Pukkunbu, Snowball the Bird, Kitano Cow, Utley and Hoover Cow, Bartholomew Bear, Tubby the Pig, Pinky (Shiny Music Hall dog), Paleman, Violet the Dog, Fang the Shiny Music Hall Dog, Blooper (Shiny Music Hall dog), Wooferino, Sagwa Miao, Dongwa Miao, Sheegwa Miao, Huckle Cat, Sally Cat, Lowly Worm, Hilda Hippo, Gumball Watterson, Darwin Watterson, Archie the Cootie Bug, Gold-Dust, Coal the Dog, Tooty the Dog, Rude Dog, The Dweebs, Yoyo (Simsala Grimm), Doc Croc, The GFTC Fox, Ryantepuppydog242 (KJ Beagle), Sophie the Otter, Blacky, and Jerry the Mouse (Tom and Jerry).
The GFTC Wolf, Danny Dingo, Katz, Madame Mousey, Dark Justin Puppy, Nega Denniss, Discord, Azrael (The Smurfs), Ootsie & Bootsie Snootie, Tom Cat (Tom and Jerry), The Blue Aardvark (from The Ant and the Aardvark), Joey the Kangaroo (The Penguins of Madagascar), Dark End (Stitch! anime), The Antitoons (from Rayman 1), Sheldon J. Plankton, King Bowser Koopa, The Nixels, Major Nixel, King Nixel, Cy Sly (Ovide and the Gang), Cackletta, Fawful, Hooktail, Gloomtail & Bonetail (from Paper Mario: The Thousand-Year Door), Doggymon, Captain Crocodile (Disney's Robin Hood), Xander Coyote, Lil' Lightning (101 Dalmatians II: Patch's London Adventure), Freddy Fazbear, Springtrap, The Nightmare Animatronics from FNAF 4, Captain Gutt, Squint, Flynn, Raz, Silas, Gupta, and Dobson (Ice Age 4), Scar, Zira, Shenzi, Banzai & Ed (the hyenas from The Lion King), Jelly Otter (usually), Joey, Dee Dee & Marky, Mr. Dark (Rayman 1), Dark R1 Rayman/Raymesis Jr., Admiral Razorbeard and his Robot Pirates (Rayman 2: The Great Escape), Vlad Masters/Plasmius, Skulker, Ember McLain, Desiree, Pariah Dark, Penelope Spectra, Bertrand, Youngblood, Johnny 13, Kitty, and Freakshow (Danny Phantom), Jinx, Gizmo, Mammoth, See-More, Billy Numerous, Brother Blood, Control Freak, The ConHares, Black Wolf (The Flight Before Christmas), Phango (Khumba), Don Karnage and the Air Pirates (from TaleSpin), Felicia Karnage, Packbat & Gatorpossum (1987 Sylvanian Families), Wilde Wolf, Catchum Crocodile, Leland Lizard, Cajun Fox, Seymour the Cat (Rude Dog and the Dweebs), Bebop and Rocksteady (1987 Teenage Mutant Ninja Turtles), Shredder, Adolf Wolf (Tex Avery's 1942 "Blitz Wolf"), Von Vulture, Samuel the Otter, Blackfrost the Dragon and Usagi the Evil Mutant Dragon
- Nicknames: JP, Puppy-Boy
- Species: Dog (obviously)
- Hometown: Toontown Central
- Favorite Characters: Rayman (R1 and R2 versions), Bubsy Bobcat, Max Goof (from Goof Troop), Parappa the Rapper, Little Beeper, Furrball the Cat, Babs Bunny, Buster Bunny, Plucky Duck, Hamton J. Pig, Calamity Coyote, Dizzy Devil, Dotty Dog (The 80's Get Along Gang), Patty Rabbit (Maple Town), Danny Dog (Maple Town), Woof (Where's Waldo?), Oggy the Cat (Oggy and the Cockroaches), Roofus the Roller Roo, Kooky A. Bird, Rude Dog (Rude Dog and the Dweebs), Tweek, Caboose, Satch & Kibble (Rude Dog and the Dweebs), Scruff the Puppy (D'Ocon), Phineas Flynn, Ferb Fletcher, Bonnie the Bunny & Foxy the Pirate (FNAF), Danny Fenton, Sam Manson, Tucker Foley & Cujo the Ghost Dog (Danny Phantom), Blue the Dog (Blue's Clues), Fauntleroy Fox & Crawford Crow (Screen Gems' "The Fox and the Crow"), Shifty Dingo & Flap Platypus (Adventures of Blinky Bill), Digit, Delete & the CyberSquad (Cyberchase), Spyro the Dragon (Classic and LoS versions), Volectro, Flurr, Flain, Glurt & Teslo (Mixels), Marshall, Rocky & Zuma (P.A.W Patrol), Huckle Cat (The Busy World of Richard Scarry), La Brea & Marshall (from Dino Babies), Gold-Dust (AKA the 1987-90 ABC SatAM Dog), Coal (AKA the ABC All-Star Saturday Dog), Tooty (AKA the 1985-86 ABC SatAM Dog), Red Rover (from Mattel), Panini (from Chowder), Rainbow Dash, Flippy Doggenbottom (from Toontown Online, Infinite and Rewritten), Cooler (80's Pound Puppies), Frankie (Jumpstart First Grade), and more.
- Favorite TV Genres: Cartoon, comedy, action, adventure
- Favorite Shows: Goof Troop, Danny Phantom, Phineas and Ferb, Jimmy Neutron, Retro Cartoon Network and Nickelodeon cartoons, Back at the Barnyard, American Dragon Jake Long(the 1st season), 2 Stupid Dogs, Johnny Test, The Amazing World of Gumball, Teenage Mutant Ninja Turtles(original 1985 and Nickelodeon's 2012 versions), Oggy and the Cockroaches, The Get Along Gang, Rude Dog and the Dweebs, Maple Town, Simsala Grimm, Dino Babies, Adventures of Blinky Bill, 2 Stupid Dogs, P.A.W. Patrol, Mixels, Dino Squad, Tiny Toon Adventures, Blue's Clues, Scruff (D'Ocon Films cartoon), and many others.
- Least Favorite Shows: Happy Tree Friends (he hates that cartoon), Breadwinners and Dora the Explorer
- Favorite Video Games: Rayman (1 & 2), Bubsy, Parappa the Rapper 1 & 2, Um Jammer Lammy, Spyro the Dragon series (excluding Skylanders), Pokemon, Toontown Online/Rewritten, Toonstruck, Banjo-Kazooie, Jumpstart First Grade, Reader Rabbit, School Zone Interactive games, Spore, and Edmark's "House" series.
- Favorite Films: Looney Tunes: Back in Action, The Wiggles Magical Adventure: A Wiggly Movie, We're Back! A Dinosaur's Story, the Land Before Time series, The Lion King, A Goofy Movie, Ferngully: The Last Rainforest, Rio 2, Mr. Peabody and Sherman, Open Season, Madagascar 2, The Lego Movie, Jimmy Neutron: Boy Genius, and Khumba.
- Favorite Companies: Old Nickelodeon (pre-2009), Ubisoft Entertainment, Knowledge Adventure, DiC Entertainment, Cookie Jar, Cartoon Network, Paramount, School Zone Interactive, 20th Century Fox, DreamWorks Animation, DisneyToon Studio, and NanaOn-Sha.
- Favorite Season: Summer
- Favorite Game Consoles: Playstation 1 & 4, the original Xbox, Nintendo 64, Wii U and the TOON-Box Quantum.
- Favorite Computer Operation Systems: Windows 98, 7 & XP
- Favorite Holidays: Halloween, Christmas and the 4th of July
- Favorite Places to Go: Red Robin, Toys 'R' Us, Chuck E. Cheese's,
- Favorite Fantasy/Supernatural Creatures: Dragons, werewolves, fairies, griffins, and mermaids.
- Favorite Pokémon: Pikachu, Riolu, Eevee, Vaporeon, Jolteon, Umbreon, Glaceon, Slyveon, Leafeon, Charizard, Flygon, and Froakie
- Favorite Food: Nachos, Mac & Cheese (mostly Kraft or Annie's), Grilled Cheese, French Fries, Pizza
- Favorite Drinks: Sprite, Kool-Aid or Hi-C Fruit Punch
- Favorite Songs: 80's Pop music, Rock-n-Roll, She Ain't You (by Chris Brown) Der Kommissar (by After the Fire), Pocketful of Sunshine (by Natasha Bedingfield), Beds are Burning (by Midnight Oil), Uma Thurman (by Fall Out Boy), Kickstart My Heart (by Motley Crue), Gangnam Style, and more.
Normal Voice actor: Jason Marsden (current), Tom Kenny (Only for J&D's versions of Ice Age 3 & 4)
GoAnimate Voice: Eric
- Justin's appearance is based off of Pluto(from Walt Disney), Frankie(from Jumpstart), and Porkchop(from Doug).
- Justin doesn't like Minecraft, chibi style or realistic style.
- According to J&D, Justin Puppy was named after Justin Timberlake, not Justin Bieber.