Austin & Ally

In November 2012, Disney Channel announced that the series would crossover with Jessie as an hour-long special episode titled "Austin & Jessie & Ally All Star New Year". The special aired on December 7, 2012, in which Austin finally gets to perform in Times Square on New Year's Eve like he has always dreamed of, with help from Jessie and the Ross children. Later, Jessie and the children travel to Miami with the group. Jessie inadvertently steals lyrics that were written by Zuri and tries to get Austin to sing them with her. Meanwhile, Ravi is jealous to see that the family's pet lizard, Mrs. Kipling, may have a crush on Dez, though it turns out that Mrs. Kipling does not like Dez at all.

The main characters, from left to right: Trish, Austin Moon, Ally Dawson, and Dez.

• Ross Lynch as Austin Moon, an outgoing, confident, and talented singer. After becoming an overnight Internet sensation by performing a song he overheard Ally singing, Ally tracks him down to confront him for theft, but they eventually become friends instead and decide to form a musical partnership. His partnership with Ally is initially built on the idea that "he rocks; she writes". Ally is a brilliant songwriter, but is too timid to perform her own music, while Austin loves to perform, but is unable to write songs for himself. Their radically different personalities tend to clash early on, though they find they're much more alike than they think as their friendship develops, leading to an on-again, off-again romance starting in the second season. In the third season, they begin to date again and are found in a healthy, secure relationship throughout the fourth season. Austin's best friend is Dez, who directs and films all of his music videos, and his manager is Trish. Austin gives music lessons and teaches students about being a performer at the A&A Music Factory in the fourth season. In the series finale, it is revealed that Austin is married to Ally and they have two children named Alex and Ava.
• Laura Marano as Ally Dawson, a smart girl and a singer-songwriter with severe stage fright and a quiet, shy personality. Ally's father ran a music store and that's where Ally learned to love music and write songs. She originally wrote for herself, but after Austin accidentally stole one of her songs and became an Internet sensation as a result, she and her best friend, Trish, track him down, and she eventually becomes his musical partner and songwriter. Her partnership with Austin is initially built on the idea that "she writes; he rocks". Ally is a brilliant songwriter, but is too timid to perform her own music, while Austin loves to perform, but is unable to write songs for himself. Their radically different personalities tend to clash early on, though they find they're much more alike than they think as their friendship develops, leading to an on-again, off-again romance starting in the second season. In the third season, they begin to date again and are found in a healthy, secure relationship throughout the fourth season. Ally works at her father's music store, Sonic Boom, until she manages to conquer her stage fright and begins her own career, at which point the store becomes the A&A Music Factory. She gives music lessons and teaches students about being a performer at the Music Factory in the fourth season. In the series finale, it is revealed that Ally is married to Austin and they have two children named Alex and Ava.
• Raini Rodriguez as Trish, Ally's best friend and Austin's manager. She is sarcastic, snarky, lazy, vindictive, has little patience, and has a bit of a temper, but cares very much for her friends. Her jobs change frequently due to her lack of effort and presence at work. She takes her job as Austin's manager, however, fairly seriously and she also became Ally's manager when her career takes off. She has a complicated love-hate relationship with Dez. She teaches students at the A&A Music Factory about being a celebrity manager in the fourth season.
• Calum Worthy as Dez, an aspiring director with an odd personality and an unusual fashion style. He films all of Austin's music videos and is Austin's best friend. He's considerably dense and lacks much logical understanding which tends to lead him and the group into messy situations. He has a complicated love-hate relationship with Trish. He teaches students at the A&A Music Factory about filming and directing music videos in the fourth season.

• Cole Sand as Nelson, an awkward young boy who takes music lessons from Ally. He constantly uses the phrase, "Aww, nartz!" and tends to mix up words that sound alike, such as "oboe" and "hobo".
• Andy Milder as Lester Dawson, Ally's cheapskate father who owns the music store Sonic Boom. He is completely ignorant of Ally's musical talents and believes that Ally has a billion-to-one shot at making it in the music business, just like Austin's parents have told him. He and Penny, Ally's mother, are divorced.
• Richard Whiten as Jimmy Starr, the owner of Starr Records who signs Austin to his record label.
• Aubrey Miller as Megan Simms, a 10-year-old reporter and photographer for Cheetah Beat Magazine. Megan is eccentric and constantly uses teenage slang terms such as "totes" or "hilar". She is stubborn and nosy as well, as she is bent on getting the stories she's after for the magazine.
• John Henson as Mike Moon, Austin's father, who co-owns the mattress store Moon's Mattress Kingdom.
• Jill Benjamin as Mimi Moon, Austin's mother, who used to be a hand model before co-owning Moon's Mattress Kingdom.
• Kiersey Clemons as Kira Starr, Jimmy Starr's daughter and Austin's ex-girlfriend. Kira temporarily had a case of repugnant breath, causing the group to be extremely wary of her throughout "Ferris Wheels & Funky Breath". Her bad breath was caused by her constant eating of garlic and anchovy pizza. Her bad breath cleared away afterward.
• John Paul Green as Chuck, a short, country-speaking teenager who believes he is better than Dez at everything. Their rivalry follows a long history of their families feuding, so Chuck and Dez often get into similar battles. He usually wears cowboy attire.
• Ashley Fink as Mindy, the manager of The Melody Diner and has a crush on Dez. Dez himself has no interest in her and is more intimidated by her than anything, as Mindy is overbearing and aggressive.
• Joe Rowley as Ronnie Ramone, the owner of Ramone Records, who signs Ally to his record label.
• Hannah Kat Jones as Carrie, a waitress at Shredder's Beach Club, Piper's sister, and Dez's girlfriend. She broke up with him in Los Angeles, but they got back together in "Wedding Bells & Wacky Birds".
• Hayley Erin as Piper, Carrie's sister and Austin's ex-girlfriend.
• Cameron Deane Stewart as Jace, a boy who Trish met when she was on tour and Trish's long-distance boyfriend.
• Cameron Jebo as Gavin Young, a country performer and Ally's ex-boyfriend.