Fifer Pig plays the flute and is a jolly pig. He is the pig that made the house of straw and hay.
Fiddler Pig plays the fiddle and wears a sailor suit similar to that of Donald Duck's. He is responsible for building the house of sticks.
Practical Pig is stern, serious and lives up to his name as practical. He is the only pig with common sense and the most competent of the pigs. He loves to play but believes that people should work first and then goof off when they're done. He builds the brick house and is the one responsible for saving his brothers and himself from the Big Bad Wolf. Aside from his hard work nature, he is a master piano player.
In animation, Practical has notably always shared the same voice actor as Goofy.
The one thing all of the shorts have in common is the fact that the pigs must rescue themselves from the wolf. In the original Three Little Pigs short, the pigs first build their now famous homes and is first encountered by the wolf. The straw and stick houses are destroyed but the brick house remains and they defeat the wolf by having him fall into a boiling pot and run away in fear. The three celebrate their success.
In each of these three sequels, Fiddler and Fifer would be fooled by the Big Bad Wolf's disguises (despite having been able to see through his sheep disguise in the first short) and get into trouble as a result, but Practical would always defeat the Wolf in the end. The Pigs also made cameo appearances as audience members in Mickey's Polo Team and Toby Tortoise Returns.
The Pigs made regular appearances in the animated series House of Mouse as guests at the titular club. In the second episode, they appeared as a backup jazz band for the Wolf, as Big Bad Wolf Daddy; the reason for this is that they are under a contract that says the Wolf will eat them unless they play for him. Later episodes, however, depicted the pigs in their original forms, and although they always appeared together, Practical was usually the only pig to speak.
The Three Little Pigs make a brief appearance at the end of the episode "Goldilocks and the 7D". After Goldilocks flees the dwarves before they chase her out, she runs into a brick house yelling the same deceptive claim of being innocent she used to break into other people's homes. The owners of the house, revealed to be the Pigs, are smitten by her harmless appearance, indicating the same fate to fall for the unfortunate three.
The pigs appear in the episode "No", where they borrow Mickey's house by collecting several pieces of it with construction vehicles. They later return the favor by rebuilding the home with even more stories and luxury. In the end, they join the other cast of guest characters in asking to join Mickey and Minnie for a movie, though they are politely turned away.
In addition to the follow-up cartoons, the Pigs had a longer career in the Silly Symphonies comic strip and Disney comic books. In Walt Disney's Comics and Stories #54 (printed in March 1945), the Pigs met and befriended the Big Bad Wolf's son, Li'l Bad Wolf, who, despite his name, would rather be friends with the pigs, much to his father's chagrin. They were also sometimes shown to be Junior Woodchucks.
The scrapped versions of the pigs appear in this video game. The first pig Mickey meets in the game is Fifer, who is seen inside the Mean Street Cinema and gives Mickey a quest to help find his two brothers, who have gone missing.
Once the three are reunited, they return to their recording studio inside the Pig Family Treehouse in Ventureland, after which they ask Mickey to help them pay off a debt--which he can do either by listening to Practical and helping them make a new record album or by listening to Fifer's suggestion of having them play for The Usher at the Mean Street Cinema.
The pigs were regulars in Disneyland's version of Fantasmic! from 1992-1994, riding the Mark Twain Riverboat, until they were replaced by newer characters. They returned for a few special performances in May 2012.
They make vocal appearances during the Happy Hallowishes fireworks show, singing "Who's Afraid of the Big Bad Wolf?"