Waddles' first appearance is with Mabel in the series opening credits, in which Mabel is hugging him.
His official debut is in the episode, "The Time Traveler's Pig," where Mabel wins him in a "Guess the Critter's Weight" game run by Sprott. She looks at the pigs until one of them oinks, which she interprets as him saying either "Mabel" or "Doorbell." Taking this as a sign, Mabel asks Sprott to let her guess the pig's weight. He tells her his name, "15-Poundy," giving her the answer to his weight. As the pig's name is "15-Poundy," Mabel guesses correctly that he weighs 15 pounds. Sprott accuses Mabel of being a witch before giving her the pig. She takes the pig, renames him Waddles, and quickly forms a great friendship with him.
The bond between Mabel and Waddles is strengthened each time the twins travel back through time and she wins him over and over again, and she and the pig do things such as sharing pizza and taking photographs at photo booths. As a result, she spirals into depression when she loses him to Pacifica in the only timeline Dipper finds successful to stop Robbie from dating Wendy. After realizing how much Waddles means to her, Dipper goes back in time and sacrifices his chance with Wendy, allowing Mabel to re-win Waddles. To show her appreciation, Mabel sends Waddles to retrieve the caramel apple Robbie is sharing with his new girlfriend, Wendy. This startles Robbie, causing him to drop the apple and knock over a barrel of hot water, painfully shrinking his already tight pants.
In "Fight Fighters," Waddles sits next to Mabel as she plays a card game with Stan Pines, and, when Robbie appears at the Mystery Shack, Mabel asks if Dipper wants her to sic Waddles on Robbie again, referring to "The Time Traveler's Pig." He later sits on the easy chair with Mabel while she watches TV. At another point, he sits next to Mabel at the table while Dipper worriedly paces about his upcoming fight with Robbie.
Stan later uses Waddles in attempting to scare off two kids, and he makes it look like Waddles is coming out of his stomach. At the end of the episode, Waddles eats some of the candy Stan receives while everyone watches a horror movie for the remainder of the night.
Grenda, Candy, and Mabel are later seen taking pictures of Waddles and adding captions, similar to internet memes such as the "lolcat."
In "Boss Mabel," Waddles is first seen watching Cash Wheel with Dipper, Mabel, and Stan while eating Chipackerz. When Mabel becomes the boss of the Mystery Shack, she makes Waddles her secretary. Near the end of the episode, Mabel asks Waddles for his opinion on Stan's apology song. Waddles reets and Mabel declares take thirty.
In "Bottomless Pit!," Waddles is first seen in Dipper's story, "Voice Over." Mabel, Wendy, and Soos play a variant of spin the bottle called "Spin the Pig", in which they spin Waddles and whomever he lands on must kiss him. He is later seen in Mabel's story, "Trooth Ache," when Mabel asks Waddles for advice, and then pretends like Waddles is answering.
In "Carpet Diem," Waddles is shown enjoying himself on the carpet and when Soos pats his head, they switch bodies. When this happens, Soos leaves the Mystery Shack on an "adventure" while Waddles walks around the Mystery Shack looking for things to eat. Eventually, Waddles ends up in the gift shop and starts chewing on some clothes. When Wendy walks in and sees Waddles (whom she mistakes as Soos obviously since Waddles is in Soos' body) she leaves, and next Grunkle Stan walks in. After explaining that Stan needs to cut Soos' pay, Waddles puts his hand on Stan's nose and starts disturbing him. Eventually, Stan gives in, creeped out, and gives Soos a raise instead. Soon, a woman walks into the shack and asks for directions. Waddles (in Soos' body) sees the door open and walks through. The woman thinks he is showing her the way, and follows him. Later in the episode, Soos and Waddles switch back into their own bodies.
Waddles is seen briefly in "Boyz Crazy," when he is sitting by Candy while the girls are getting ready to go to the Sev'ral Timez concert. He then is hugged by Dipper when he hears Wendy almost breaking up with Robbie. He is again seen when Deep Chris pets him on the head and says, "What up, girl?"
In "Dreamscaperers," Waddles is briefly shown in the beginning of the episode. He is laying down behind to Mabel, sleeping, as Mabel and Dipper play Conflict Boat. Then, when Grunkle Stan calls down the Pines twins, Waddles perks up but doesn't leave with the twins.In "Gideon Rises," Waddles first appears in the Mystery Shack's Grand Closing, where Gideon Gleeful, who had taken possession of Waddles, presented him to his audience as Li'l Gideon Jr., Gideon Land's mascot. Later, when Li'l Gideon is looking through Journal 2, Waddles tries to escape through a window, but Gideon uses a whistle to force Waddles back into a corner of the room, leaving Waddles cowering. Later, after Gideon is proven as a fake and is arrested, Mabel is seen holding Waddles in the air as his Li'l Gideon Jr. costume burns in the fireplace nearby.
In "Scary-oke," Waddles joined in the fun at the Mystery Shack's grand re-opening party. When zombies crashed the party everyone scattered. Waddles, Mabel, and Dipper hid in the Mystery Shack but it didn't stop the zombies from breaking in. Stan came to help and eventually the zombies were dealt with.
In "The Golf War," Waddles is shown in the beginning eating with Dipper. As the Pines Family and Soos march out, Soos mentions that Waddles would look after the shack.
In "Sock Opera," Waddles plays a part in Mabel's sock puppet rock opera. At first, Mabel designs a cardboard to represent Waddles; in latter acts, Waddles itself brings a ring as of the wedding scene.
In the "Little Gift Shop of Horrors" segment "Abaconings," Waddles accidentally eats brain-enhancing jelly derived from percepshroom that Dipper applied to his forehead overnight. Waddles becomes extremely intelligent and builds a machine to communicate with and drive around in. He also uses his intellect to finish the What-the-heck-ahedron, build a jet pack, a laser gun and the Smarticle Accelerator. Waddles eventually presses a button that reverts him back to his normal pig intelligence level.
Sometime before the events of "The Love God," he and Gompers got "married" with the assistance of Dipper, Mabel, Wendy, Candy, and Grenda. They were forced together using duct tape. Mabel calls them the "power couple."
In "Not What He Seems," Waddles is secured by the special ops team along with the rest of the Mystery Shack.
In "Dungeons, Dungeons, and More Dungeons," Waddles is seen sitting on the sofa in the living room when Mabel writes a letter to her parents.
In "The Stanchurian Candidate," in the living room Wendy writes "Swines 4 Pines" on one side of Waddles and "Bud is a dud" on the other side. Waddles then runs off screen.
He is seen briefly in "Dipper and Mabel vs. the Future", when Mabel is looking at her scrapbook.
In "Weirdmageddon 2: Escape From Reality," Waddles while in Mabeland is gigantic, serving as a transportation for the creatures there. Waddles later escapes from the dream world with Dipper, Mabel, Wendy and Soos, returning to his normal size and losing the star shape around his left eye.
In "Weirdmageddon 3: Take Back The Falls ", Waddles helped operate the giant Mystery Shack mech. While the family tried to recover Stan's memory, Waddles jumped onto Stan's lap and began to lick his face. Out of instinct, Stan told them to get Waddles off of him, kick-starting his memory to return. At the end of the summer, Mabel attempted to say goodbye to him but couldn't bring herself to. She also adds that she can't take Waddles home because her parents won't let her do so, despite Waddles' attempt to stay with her. Filled with compassion, Stan feigned frustration of having to live with Waddles all summer, picked him up and put him on the bus, saying that Dipper and Mabel's parents will have to learn to have a pet pig whether they like it or not. When the bus driver tries to remove Waddles from the bus (as no animals are allowed by policy), Stan and Ford threatened him with a brass knuckle and laser gun respectively. This effectively changed the bus driver's mind, allowing Waddles onto the bus so that he could go home with Dipper and Mabel. He is last seen sleeping with the kids as they reach Piedmont while the final credits finish.
Waddles is a light pink pig with a darker pink spot on his left eye, and two spots on his left side, one large and one tiny, close to his tail, with some additional spots on his right side body. His snout is a slightly darker hot pink color. He has a short, curly tail and his hooves are grayish black. His face is plump and he weighs 15 pounds.
- Intro: "Gravity Falls Main Title Theme"
- 109. "The Time Traveler's Pig"
- 110. "Fight Fighters"
- 112. "Summerween"
- 113. "Boss Mabel"
- 114. "Bottomless Pit!"
- 115. "The Deep End"
- 116. "Carpet Diem"
- 117. "Boyz Crazy"
- 118. "Land Before Swine"
- 119. "Dreamscaperers" (no lines)
- 120. "Gideon Rises"
- 7. "Mabel's Guide to Dating"
- 8. "Mabel's Guide to Stickers"
- 9. "Mabel's Guide to Fashion"
- 10. "Mabel's Guide to Color"
- 11. "Mabel's Guide to Art"
- 16. "Mabel's Scrapbook: Heist Movie"
- 201. "Scary-oke"
- 203. "The Golf War"
- 204. "Sock Opera"
- 205. "Soos and the Real Girl" (mentioned)
- 206. "Little Gift Shop of Horrors"
- 207. "Society of the Blind Eye" (pictured)
- 208. "Blendin's Game" (flashback, no lines)
- 209. "The Love God"
- 211. "Not What He Seems"
- 213. "Dungeons, Dungeons, and More Dungeons" (no lines)
- 214. "The Stanchurian Candidate"
- 217. "Dipper and Mabel vs. the Future" (no lines)
- 219. "Weirdmageddon 2: Escape From Reality"
- 220. "Weirdmageddon 3: Take Back The Falls"
- Postcard Creator
- Haunted Hunt
- Li'l Gideon Shrinks Back
- PigPig Waddles Bounce Ultra
- Mabel's Doodleblaster
- Gravity Falls: Legend of the Gnome Gemulets
- Waddles Food Fever
- Waddles was named by Aury Wallington, one of the writers for the show. She named him after her own pet pigs she owned during her childhood. Every year she'd raise, care, and love the pig for months, and every year her family would cook and eat Waddles. She'd get another pig for 4H and the cycle repeated itself for years.
- Alex Hirsch gave Mabel a pig because his sister, Ariel Hirsch, always dreamed of having one and has a pig shrine in her room.
- Waddles was nominated for "Favorite Animated Animal Sidekick," at the 2014 Kids' Choice Awards, but lost to Patrick Star from Spongebob Squarepants.
- Waddles can somehow oink as the sound resembling an answer to someone's questions, such as "Mabel", "time curse", "thank you", and "Tambry".
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