Timmy and Tommy Tibble

Thomas "Tommy" Tibble and Timothy "Timmy" Tibble are energetic twin brothers in D.W.'s preschool class. Together they are known as the Tibble twins or the Tibbles. They are the main antagonists of D.W.'s own episodes.

Description
Timmy and Tommy are bears in the show and humans in the book. They always dress identically. They normally wear yellow T-shirts, purple shorts, yellow socks, and black and white sneakers. As they are identical twins, Timmy always wears a blue scarf while Tommy wears a red one to differentiate. Originally in the books, they looked more like humans and less like bears, but that changed in the cartoon series. Notably, however, in even later book releases, they continued to appear as humans, despite the significant art shift in the books towards an appearance more in line with that of the television series.

In one episode, they both wear blue jeans with a yellow stripe and dark-grey sneakers. Timmy wears a blue shirt, while Tommy wears a red one, each with yellow design.

Their personalities can be described as manipulative (for instance when they trick people so they can get what they want as was seen in several episodes, including To Tibble the Truth), liars, and sadistic. They could even be described as a fair weather friend (for those of you who don't know, a fair weather friend is someone who only helps when it's advantageous to themselves) as is the case in Never, Never, Never! where they tricked D.W. into thinking they care about her in order to get her toys and destroy them in front of her face.

Specials

 * Arthur's Perfect Christmas
 * Arthur - It's Only Rock 'n' Roll
 * D.W. and the Beastly Birthday
 * Arthur and the Haunted Tree House

Arthur

 * Season 1
 * Arthur and the Real Mr. Ratburn 10201
 * D.W. All Wet 10301
 * D.W. the Copycat 10502
 * Arthur Babysits 10901
 * D.W.'s Baby 11102
 * Arthur's Lost Dog 11202
 * So Long, Spanky 11301
 * D.W. Flips 11602
 * D.W. Rides Again 11901
 * D.W. Gets Lost 12402
 * D.W.'s Blankie 12701
 * My Club Rules 12901
 * Season 2
 * Go to Your Room, D.W. 20402
 * Play it Again, D.W. 20602
 * D.W.'s Deer Friend 21101
 * Arthur vs. the Piano 20801
 * Water and the Brain 21301
 * D.W.'s Name Game 21901
 * Sue Ellen's Little Sister 22002
 * Season 3
 * D.W. All Fired Up 30201
 * I'd Rather Read It Myself 30202
 * The Chips are Down 30501
 * Revenge of the Chip 30502
 * Attack of the Turbo Tibbles 31001
 * Double Tibble Trouble 31101
 * Arthur's Almost Live Not Real Music Festival 31102
 * D.W.'s Perfect Wish 31402
 * Season 4
 * D.W.'s Library Card 40101
 * Buster's Breathless 40301
 * Prove It 40402
 * D.W. Tale Spins 40601
 * 1001 Dads 40801
 * Prunella's Prediction 40802
 * What is that Thing? 40901
 * My Music Rules 41001
 * Season 5
 * Arthur and the Big Riddle 50101
 * Nerves of Steal 50202
 * You Are Arthur 50502
 * Sleep No More 50701
 * The Last of Mary Moo Cow 50801
 * Just Desserts 50901
 * Arthur's Family Feud 51001
 * Season 6
 * Arthur Plays the Blues 60201
 * Buster's Sweet Success 60202
 * The Boy Who Cried Comet 60501
 * D.W.'s Backpack Mishap 60602
 * More! 60702
 * Season 7
 * To Tibble the Truth 70401
 * Elwood City Turns 100! 70500
 * Season 8
 * D.W., Dancing Queen 80402
 * Sue Ellen Chickens Out 80502
 * Desperately Seeking Stanley 80702
 * Tales from the Crib 80802
 * Kiss and Tell 80902
 * Bleep 81002
 * Season 9
 * The Law of the Jungle Gym 90302
 * My Fair Tommy 90402
 * Arthur Makes Waves 90601
 * Emily Swallows a Horse 90802
 * D.W. Beats All 90901
 * Breezy Listening Blues 91002
 * Season 10
 * Happy Anniversary 100100
 * The Secret About Secrets 100302
 * D.W. Aims High 100501
 * D.W., Bossy Boots 100702
 * Operation: D.W.! 100802
 * Season 11
 * Germophobia 110102
 * Mind Your Manners 110202
 * Buenas Noches, Vicita 110301
 * Baby Kate and the Imaginary Mystery 110501
 * Dancing Fools 110602
 * Hic or Treat 110701
 * D.W. On Ice 110901
 * Season 12
 * Never, Never, Never 120102
 * Room to Ride 120201
 * Ungifted 120402
 * Season 13
 * The Good, the Bad, and the Binky 130402
 * D.W. Swims with the Fishes 130602
 * A Portrait of the Artist as a Young Tibble 130701
 * Season 14
 * D.W. Unties the Knot 140202
 * D.W., Queen of the Comeback 140901
 * In My Africa 140902
 * Season 15
 * Fifteen 150100
 * Whistling in the Wind 150202
 * The Last King of Lambland 150302
 * Muffy's Classy Classics Club 150801
 * Season 16
 * All About D.W. 160301
 * Blockheads 160302
 * Night of the Tibble 160501
 * Read and Flumberghast 160502
 * On the Buster Scale 160802
 * Season 17
 * Waiting for Snow 170602
 * Brain Freeze 171002
 * Season 18
 * Best Wishes 180401
 * Two Minutes 180701
 * Messy Dress Mess 180702
 * Tibbles to the Rescue 180802
 * The Pageant Pickle 180901
 * Season 19
 * The Last Day 1910
 * Season 20
 * Fern's Flights of Fancy 200201
 * Bunny Trouble 200302
 * That's MY Grandma! 200402
 * Season 21
 * The Lost Dinosaur 210601
 * The Princess Problem 210602

Personalities
Timmy and Tommy are mischievous, clever, reckless and often really mean and annoying (Sometimes one more than the other), though deep down they are good kids. Timmy is more independent and meaner than his brother, as seen in "Double Tibble Trouble" and "Attack of the Turbo Tibbles." "Two Minutes" and "Whistling in the Wind" reveal that Tommy is two minutes older, causing him to act superior to Timmy in both episodes. In "Double Tibble Trouble," Tommy is less energetic and feels sad when Timmy is sick, but at the end of the episode, when Tommy gets sick, Timmy doesn't seem sad and behaves like always. In "Attack of the Turbo Tibbles," Timmy is the one who hurts D.W.. They each have their own ways of annoying others, usually by yelling louder than one another. Tommy also seems to have more of a sensitive side than Timmy.

Family
Timmy and Tommy live with their grandmother in a large house that looks almost haunted.
 * Mrs. Tibble: Timmy and Tommy's grandmother. She loves them very much but doesn't always show awareness of their bad behavior, though she does occasionally show signs of distress at their actions. The Tibbles do not tell her about their misbehavior, and when they do, they censor it to not sound like bullying. In "Mind Your Manners", they force themselves to learn manners in order to take her out to dinner. They usually spend all of their time at her house when they're not in preschool.
 * Trixie Tibble:" Timmy and Tommy's mother. She is first mentioned in "D.W.'s Backpack Mishap," where we find out that she used to take them on trips around the world.

Friends

 * D.W. Read: Timmy and Tommy are her friends, but often try to compete with and pester her. They bully her in "D.W., Queen of the Comeback", and scam her out of all her toys (which they then destroy) in "Never, Never, Never."
 * Emily: She is D.W.'s best friend. They often try to compete with her as well.
 * James MacDonald: In "Night of the Tibble," James is invited to a sleepover with the Tibbles. They are genuinely excited about it, and tire themselves out while preparing for his visit.

Timmy Tibble

 * Ricky Mabe: Season 1-5, "Arthur's Perfect Christmas"
 * Samuel Holden: Season 6-9, "Arthur - It's Only Rock 'n' Roll"
 * Tyler Brody-Stein: Season 10-11
 * Chris Lortie: Season 12-13
 * Dakota Goyo: Season 14-15
 * Jacob Ewaniuk: Season 16-19
 * Samuel Faraci: Season 20-present
 * Max Henry Wolf: "Arthur's Missing Pal"

Tommy Tibble

 * Jonathan Koensgen: Season 1-6, "Arthur's Perfect Christmas"
 * Aaron Grunfeld: Season 7-8, "Arthur - It's Only Rock 'n' Roll"
 * Tyler Brody-Stein: Season 9
 * Ryan Tilson: Season 10-11
 * Jake Roseman: Season 12-13
 * Jake Sim: Season 14-19
 * Devan Cohen: Season 20-present
 * Madison Danielle: "Arthur's Missing Pal"

Trivia

 * In "Bleep", Timmy can whistle, but in "Whistling in the Wind" he can't; however, it is possible that the events of the latter occurred before the former, or that Timmy might have learned to whistle during the course of these episodes.
 * Tommy and Timmy take folk music lessons. Tommy plays the pan pipes.