In her childhood, while awaiting one Christmas, Peaches was able to meet the magical human known as Santa Claus when the actions of her uncle, the ground sloth Sid, had ruined her family's traditional Christmas Rock. Peaches, Sid, and her two possum uncles Crash and Eddie journeyed to the North Pole, guided by a magical reindeer named Prancer. While in the North Pole, Peaches aided her herd in constructing new toys for Santa, as well as starting his tradition of using a magical reindeer-drawn sled.
Well into her formative years, Peaches grew up with both the personal traits of a mammoth and of a possum, walking on the ground at times and swinging in tree branches at others. Filled with a sense of adventure, Peaches enjoys being with her molehog friend Louis, who harbors a secret crush on her.
As a mammoth raised with customs typical to both mammoths and possums, Peaches was, in her younger years, impressionable and wide-eyed, this giving way to her later disposition as a young adult mammoth filled with a sense of adventure and excitement, always on the lookout for some new and exciting adventure, much to her father's dismay, who believed that she was not yet ready to venture off anywhere on her own.
Two mammoths, Manny and Ellie, had journeyed with their herd into an underground world ruled by dinosaurs in search of one missing member: a ground sloth named Sid. Ellie was pregnant all the while and as she was on one of the higher sections of the canyon, she went into labor: with that, Ellie called out to Manny, shouting several kinds of fruit as she tried to remember their code word for Ellie's going into labor before recalling it: Peaches. Ellie had been cornered by a number of guanlong in a canyon known as the Plates of Woe while she was giving birth to her calf, and was defended by the saber-tooth tiger named Diego.
After long, Ellie gave birth to one female calf, and Manny reached them in time, marveling at his newborn daughter, deciding that she should be called "Ellie". Ellie, on the other hand, preferred to name their daughter something more fitting: "Peaches," due to her being "sweet and round and covered with fuzz". Both parents agreed on the name, and with that, Sid appeared, along with Ellie's adoptive brothers, the possums Crash and Eddie, and a weasel named Buck, all riding a pteranodon. Sid was dropped into the scene and marveled at the new baby, initially thinking that Peaches was a boy, but when Diego pointed out that what Sid was seeing was actually the baby's tail, Sid corrected himself, and remarked that Peaches looked just like Ellie, while lamenting that his own children, three adopted tyrannosaurus, weren't with him.
Escape from Dinosaur World
The herd left the Plates, led by Buck, who guided them back to the entrance of the Dinosaur World, when an immense baryonyx emerged from the entrance, Buck greeting the beast as "Rudy". Ellie kept Peaches safe while the others dealt with Rudy. On her arrival at the surface, a snowflake falls from the sky and Peaches decides to vacuum up it with her proboscis, that makes her sneezing, Peaches was amazed at the snow around her, playing in it with her uncles.
Some time later, Peaches joined her family in celebrating christmas. When she overheard her father saying that Santa didn't exist, she decided to go to the North Pole to prove him wrong, joined by Sid, Crash and Eddie.Along the way, they met a reindeer named Prancer.
When the group made it to the North Pole, they accidentally ruined Santa's deliveries. Together with Manny, Ellie and Diego (Who had been following them), they all worked together to save Christmas.
Some years later, now 16 years old, Peaches snuck away from her parents before they woke up so she could go to the falls and meet Ethan, her best friend Louis reluctantly in tow. Manny intercepted them, and brought Peaches back. Peaches was almost by a log driven by Sid's Family, but was saved by Diego. She then slipped away, heading back to the falls. There, she slipped on some ice, crashing into Ethan. At that point, Manny arrived, and embarassed her in front of the other teens by grounding her. Incensed, Peaches stormed off. Manny followed, and an argument ensued, during which Peaches told Manny she wished he wasn't her father. At that point, the continent separated, sending Manny, Sid and Diego out to sea. Peaches was distraught over the loss of her father, and of the possibility that the last thing they did was fight.
As the land continued to break up, Peaches returned to the falls, saving Louis, telling him "No matter what, you never leave a friend behind." She came back in time to see Ellie take charge of the animals, directing them to go to the land bridge, as Manny had told her. On the way there, Peaches was so depressed that she was almost caught in a landslide, but was saved by Louis. That night, she was visited by Ethan, who invited her to join his group the next day. Peaches excitedly agreed, even when Ethan told her to "ditch the molehog." Not even Ellie's advice about not letting a boy change her affected her mood.
The next day, Peaches joined the group as they split off from the other animals to explore a cave. Along the way, Steffie and her friends pressured Peaches into saying she and Louis weren't friends. To Peaches horror, Louis had heard, and sadly burrowed away. Moments later, a landslide entered the cave, threatening to bury them all. The group got out just in time. As the Brat Pack celebrated, Peaches admonished them for their recklessnes. Steffie scoffed, asking if Peaches if she wanted to go back to "hanging out with a molehog freak," and Ethan added that it was bad enough her family was "half-possum." Incensed, Peaches left the group.
The day after, Peaches watched with regret as Louis sorrowfully walked on his own. She talked to Ellie about her mistake, and her mother assured her that she would find a way to "make things right." It was then that they finally arrived at the land bridge, only to find it destroyed.
At some point afterward, the animals were captured by Gutt and his crew. Gutt held Peaches hostage in order to lure in the returning Manny. When Manny boarded the next ship, to exchange himself for Peaches' life, Gutt went back on his word, stating that manny took everything he had from him and the evil captain intended to do the same. When all seemed lost, Louis intervened, distracting Gutt with a challenge and slamming a chunk of ice onto his foot, the pain causing him to release Peaches. When the battle against the pirates started to turn in the herds' favor, Gutt attempted to kill the bound Ellie. Peaches, using her "half-possum" skills, gave the evil ape a powerful kick, sending him to the ice wall, saving her mother just in time. As She and Ellie tried to escape, Gutt blocked Manny's path. Ellie and Peaches could only watch as the land mass Manny and Gutt on rose hundreds of feet high, leaving Manny up for the final confrontation against Gutt. After Manny defeated Gutt, Peaches thanked Louis, who echoed "No matter what, you never leave a friend behind." Taking Gutt's ship, the herd travelled to a new home. To her delight, Peaches was encouraged by her father to explore and have fun. The Brat Pack, won over by Louis' bravery, joined them.
Ice Age: Collision Course
Peaches, now 18, is engaged to another young mammoth, Julian.
Peaches has a light brown pelt with brown hair. She has her mother's green eyes as well as her father's wider face shape. In Ice Age: Continental Drift, Peaches has a bun with her bangs pulled off to the side. In Ice Age: Collision Course, she has her bangs pinned up.
Behind the Scenes