One of the two central protagonists of the story, Austin is an aspiring singer who eventually comes to partner up with Ally to sing the songs that she writes.
Acting for Two: Ross Lynch does this in the episode "Kangaroos & Chaos", playing Ralphie Hayes, a kid who's famous for eating dog food on a TV commercial, and Austin worries people are going to mistake him for that kid.
Nice Guy: Even if he screws up sometimes, he is nice to a fault. He's sweet, gentle and when he comes to understanding the feelings of others if he has hurt them, he will try his hardest to make up for it. Go look at the Heartwarming page for examples.
In one episode, he borrows a guitar from the store to get it autographed by Bruno Mars for Ally, as a way of making up for the fact that he'd been late to rehearsal. Unfortunately, he gets caught on the security camera in Sonic Boom, making people think that he's the person responsible for the string of thefts in the mall.
Another episode features him being grounded because his grades are slipping. He sneaks out of the house in order to keep his promise to Ally to perform at her fundraiser. As you might expect, his parents find out and force him to do nothing but come home and study as punishment.
Obliviously Evil: For a given value of "evil" in "Rockers & Writers". Stealing Ally's song was a pretty horrible thing to do, but in his defense, he didn't even realize he'd done it. He seriously believed the song was something he'd created. T-Fame even points this out to Austin, the latter of whom essentially did the same thing to him.
Official Couple: Not quite; he and Ally are noted to have "a thing", yet it's the closest they have to a dating relationship.
The other central protagonist of the story, Ally is a nerdy, Shrinking Violet singer-songwriter who tends to be the Straight Man to the constant shenanigans surrounding her. Ally is the brains behind Team Austin, and is responsible for writing Austin's songs and taking care of the Sonic Boom music store owned by her father.
Adorkable: When dancing. Or nervously chewing her hair. Or doing her vocal warmups. When suffering from stage fright.
Bad Liar: While Dez is the worst and Austin is worse than her, Ally is still pretty terrible at lying.
Brainy Brunette: Involved in book clubs, cloud watching clubs and wanted to learn calculus on her summer holiday. Also brainy in musical terms as she gives lessons in different instruments as well as being a great songwriter.
Bunny-Ears Lawyer: Ally is shy, neurotic and suffers from stage fright so badly she'll wreck a television studio to get away from the camera, but she writes amazing songs.
Deadpan Snarker: Ally probably beats Trish out for the biggest snarker. Trish will often just get angry, thus losing the deadpan.
Deuteragonist: Despite Ally being the central character the show revolves around for the purposes of the plot and comedy, Ally is the Deuteragonist to Austin's attempts to become famous because she hangs back and writer the songs for him. It will likely remain unless she decides to step out from the song-writing shadow and becomes a performer in her own right.
Humiliation Conga: Ally suffers a condensed one when she accidentally destroys a television studio.
I Can't Dance: She hurts Austin's ankle when he tries to teach her to dance in "Club Owners & Quinceaneras".
The Illegible: Ally's chicken-scratch leads to multiple misunderstandings in "Kangaroos & Chaos". Ally claims this is just due to being rushed, because she really went to calligraphy camp. Which if true would be an inversion.
Ally: There's no eating in X! - Once in "Rockers & Writers", four times in "Bloggers & Butterflies". Ally: Don't touch my X! - Usually it is her book. In one case it became "Don't boop my nose."
Meganekko: During the flashback to when she first developed her stage fright Ally is wearing glasses.
Noodle Incident: Whatever it was that caused Ally to develop terrible stage fright. Revealed to be because of Ally freaking out during an audition for a prestigious music school, which caused a fear of rejection.
Women Are Wiser: Compared to Austin... Dez... Trish... her father... well pretty much every other member of the cast. Even her song writing is wiser and more soulful that Austin, who is more extroverted and fun loving when he involves himself in the song writing process. Deconstructed in that these traits sometimes get in the way rather than helping. (For example, in "Songwriting and Starfish", Ally's wisdom and soulfulness prove to be decidedly less effective at writing a "Hot Summer Jam" than Austin's fun loving personality.)
Zettai Ryouiki: Ally wears a Grade A in "Tickets & Trashbags". Wears various levels in other episodes.
Her headbands seem to be deliberate. She could just be quirky.
Bunny-Ears Lawyer: Trish is shown to be lazy and irresponsible, but has gotten Austin a concert and interview and actually does a good job in her role. Perhaps because it's the only one she cares about.
Catchphrase: "Guess who got a job as/at the (insert name of job here)!"
It even stems from her days in kindergarten. "Guess who got a job as the hall monitor!"
This can be anything not concerning a job, but sometimes can be used to express an achievement of some sort.
Jerkass: For no known reason (other than being a ditz), she seems to have it out for Dez. Although it's nowhere near as bad as some of the majorly Jerkass characters on someNickelodeon shows. Of course, if she never became friends with Austin, she would be an even bigger jerkass than she is now.
When he leaves old, embarrassing pictures of Austin for H8r Girl to take as bait for a trap, he actually used real pictures because of this.
When he tried to get everyone to get out of line by telling everyone he'd hidden a horseshoe that could be redeemed for the MyTab the gang was standing in line for, it was also real and also resulted in them losing the MyTab.
Nelson is an awkward young boy who takes music lessons from Ally. He tends to show up at the music store for one reason or another and turn out to have mixed up a word for a word that sounds alike, such as "oboe" and "hobo", resulting in him having done something difficult he didn't need to do.