Buster Moon is an anthropomorphic koala. He has blue eyes and gray fur with white fur inside of his ears. He wears a white button-down shirt with a red bow tie covered by a blue suit jacket. He also wears blue pants with a black belt and brown shoes. Occasionally, when he’s not wearing the jacket, he wears his white shirt with its sleeves rolled up.
Buster Moon is truly the optimist; he doesn't know when to quit, and believes in the concept that when you've hit rock bottom, the only way left to go is up.
Buster has a sincere love for show biz, especially theater, after attending his first theatrical performance (his dreams of becoming the first koala bear in space were suddenly toast) when he was only six years old and was inspired to one day own his own theater and make his career in show business as a successful theater producer. He loves his theater and won't give it up without a fight, not only because of his love for theater, but because his father worked so hard for so long to help Buster buy the theater in order to fulfill his son's dream, and Buster keeps the bucket his father used in his car-washing business to make that dream a reality as a cherished memento.
Even when all odds seem to be against him, Buster looks for a silver lining in every cloud, no matter how unlikely or ridiculous, gives it his all, but oftentimes his refusal to quit comes back to haunt him.
His determination to save his theater from being shut down drives Buster to do anything and everything to do so, such as going to extreme lengths to avoid dealing with the bank, illegally siphoning power from a next-door business after his theater's electric bill shuts the power down, and stealing gallons of water from a water tower to set up a unique stage, and lying to his contestants about the $100,000 prize money (which was supposed to be only $1,000).
He is cheeky, opportunistic, and even a little pushy.
Buster Moon realized the dream of owning the theater when he attended the show "Epiphany" with his father, but the place has fallen on hard times with nobody coming to the shows anymore. Even though his best friend, a Suffolk sheep named Eddie, doesn’t think it’s a great idea, he decides to put on the world’s greatest singing competition as a final effort to restore the theater's popularity.
He scrapes together $1,000 for the winner, but thanks to Buster’s doddering old lizard assistant due to her glass eye popping out and bouncing off her keyboard, the flyers go out proclaiming a $100,000 prize instead, causing a stir in the animal world. And as Buster fights for his theater’s relevance, five characters become the top talent in the competition all of whom are ultimately trying to define or redefine or find themselves through music and performance.
When everything goes wrong and literally comes crashing down, Buster finally breaks and gives up, is unresponsive to his singers' support and encouragement, and is fully prepared to accept a fate of car-washing until he hears and is inspired by Meena's beautiful singing to take one last shot.
He rallies the troops, they throw together a workable open-air theater, and perform for free, each of his singers pulling off spectacular performances that redeems Buster in the eyes of the public as well as Nana Noodleman, the theater actress who was partly responsible for inspiring Buster to love theater, that she buys back the theater property and restores it to its former glory, allowing Buster to hold a grand re-opening and truly start his career as a successful theater producer.
Happy Holidays from Sing
Buster has fun at the ice rink while "Sleigh Ride" plays. After Gunter switches the music track with his holiday dance remix of "Groove Is in the Heart", he catches Miss Crawly when she loses her balance and dances with her. At the end, he poses with the rest of the Sing cast.
Sing on Tour
Pre-Show Buster addresses the audience, welcoming them to the opening night of Sing on Tour. He claims that there are some kinks and apologizes for the delay, but reassures the audience that Miss Crawly is on the job...right as the circuit board blows a fuse. Buster tells his camerawoman, Mizuki, to introduce herself while he leaves to help Miss Crawly.
Later, Mizuki finds Buster and Miss Crawly attempting to fix the circuit board. Still needing to stall for time and pleased that Mizuki introduced the audience to Rosita and Gunter, Buster pulls Mizuki towards Ash's room, instructing her to show the audience the "coolest porcupine in Rock-and-Roll." Still later, Mizuki finds Buster explaining to the squids that while he thinks they're great, he can't have them in his show. While he leaves, he tells Mizuki to keep up the good work. Finally, Mizuki and Miss Crawly both find Buster, the latter telling him that she fixed the circuit board. Buster hops onto his crescent moon prop, and tells the audience to stand clear of the doors and enjoy the show.
"This was it. The moment it all began. The moment an ordinary little guy fell in love with theater. Everything about it: the lights, the way the scenery moved, even the smell. He was only 6 years old, but his plans to become the first koala bear in space were suddenly... toast. Some folks may have said he grew up to be the greatest showman the city has ever seen. Some called him a visionary, a maverick. Sure some folks said he was as crazy as he was stubborn, but I say wonder and magic don't come easy, pal, and oh, there would never be any doubt. The name Buster Moon would go down in entertainment history. And I should know, because I am Buster..."
— Buster Moon, at the opening of the film
"My next show is gonna be, drumroll please: a singing competition!"
— Buster Moon, telling Eddie his idea
"Everyone. Just think, your neighbor, the-the-the grocery store manager, that-that-that-that chicken, right there. Everyone in the city gets a shot at being a star live on my stage!"
— Buster Moon
"Real talent from real life. That's what audiences want and I'm gonna give it to them!"
— Buster Moon
"Now, I need you to add the following information to our publicity flyers. The winner of the singing contest will receive a grand prize of... $935. Hmm. Gonna need more then that. Just a second. ... $1,000. You got it?"
— Buster Moon, telling Miss Crawly to type it in the flyers
"Let's go to work."
— Buster Moon, waking up and starting the day
"And cue the crazy old lizard."
— Buster Moon, moments before Miss Crawly enters his office
"I do? Holy moly, I really do."
— Buster Moon, seeing a group of angry animals outside his office, also when he sees a long line of animals waiting to audition
""Loud and horrible, but shows promise." Welcome to the show."
He lives in the Moon Theater, sleeping in his desk drawer.
He is at least 36 years old. In the first scene of Sing, Buster recalls being 6 years old while watching Epiphany. From that moment on, his father worked as a car washer for 30 years to buy his son the theater.
Prior to wanting to have his own theater, Buster wanted to be the first koala in space.
Buster's theater is built on 551 Echo Drive.
Buster is ambidextrous.
He may be left handed as his wristwatch is seen on his left hand before he takes it off to put it in the prize chest.
In his introduction scene, it is shown that he has a diploma from the Modern Drama Institute.