Ember makes her first appearance in New Horizons riding her Light Fury, Snowflake, are out flying and Cedar comes behind them on his Cloudshatter, Stryker. Cedar decides to go back to Blue Isle as he did not rest well the night before. Ember continues on with out him and finds an island that she starts exploring and observing. Hiccup and some of the dragon riders come over to where she was. Astrid is suspicious of the young girl at first and asks Ember if she is a dragon hunter. Ember responds with no, she is not a dragon hunter. Hiccup tells Astrid to calm down and then asks Ember who Snowflake is and then gives Ember a tour of the island, Dragon's Edge. The next day, Ember and her mom are making bread when Breeze asks if she can help. Ember lets Breeze stir the dough and then knead it before Aspen puts it near the fire to bake.
After a short-lived Dragon Hunter attack, Ember gives the Dragon Riders, who had come to help out, a tour of Blue Isle. Snotlout starts an arguement with her about the possibility of her wolf-dog, Alpine, actually being a hybrid. After the issue was resolved, the tour was finished and the Dragon Riders fly back to Dragon's Edge. The next morning, Ember was at her cousin, Strøm's house. They decide to go to a small island that they had built a hideout on. After staying there for a while, they headed back.
After they landed on Blue Isle, they went over to the Orn girls' house and asked if Lavendel (the middle of the three sisters) wanted to come on an adventure with them. She eagerly complied and they took off. They found an island outside of the Blue Isle archipelago and landed on it. After talking for a while, a thumping sound was heard and a small, three-legged Light Fury stepped out of the bushes. She was tangled in a net and a section of log was connected to it, producing the thumping sound. Ember knelt down to release the small Fury while the other two girls watched. After freeing the Light Fury, Ember formed a bond with her and gave her the name Håber. Wondering where Håber's mom was, they searched the island for an older Light Fury. Upon not finding one, they decided that her mother had either been captured by Dragon Hunters or killed. Ember took her back to Blue Isle.
When they returned, Lavendel's two sisters, Amethyst and Hazel, and Kaskade, Strøm's 16 year old sister, greeted them. Amethyst was confused by Håber's leg and asked why she only had 3 complete legs. Ember explained that Håber was probably just born like that. Ember then sent a Terror mail to Hiccup, requesting his help and advice on taking care of Håber. He comes, along with Astrid (who wanted to visit a friend she had made) and Fishlegs (who wanted to visit the stables), and helps Ember construct a prosthetic for the Light Fury. Håber struggled with keeping the prosthetic on for the first week and was constantly chewing it off. Ember got annoyed and asked Hiccup what she should do about Håber. He responded that she should train Håber to wear it and that because it was something new for her, it probably was uncomfortable and confusing. Then, over the next couple of days, Ember worked on getting Håber to wear it. Eventually she would wear it for an hour without trying to chew it off.
Later, Lavendel and her sisters decided to hold an art contest for the tribe. Ember and her friend Stormi helped them with collecting the art and sorting it out to be judged. While preparing for the contest, the girls made pamphlets to pass out around the island. Stormi accidentally dropped her stack just as a gust of wind came from in back of her. The papers flew away, prompting Stormi to coin the term "flyer". The word got around quickly and eventually the contest was finished. Snowflake began to get annoyed that Ember was spending time with Håber and other dragons. When Ember began to pet Wyndy's Tideripper, Fog, Snowflake had too much of it and flew off.