SmurfLily is smart as a whip, practical and rational. She thinks before she speaks and prefers you'd do the same. She's not afraid to tell you like it is or to take charge. Even when no one asked her to.
Lily is very smart and rational, never acts without thinking something through, and has little time for silliness. Lily is quieter than the other girls, but when she speaks, she means it. She tells it like it is and pulls no punches. She’s one of the few girls who can calm Storm down when something – or someone – has gotten her riled up.
Sometime during the events of Smurfs: The Lost Village, Smurflily ended up in Smurf Forest, where she meets Smurfette for the first time, after a quick glance, Smurflily quickly ran back to the Forbidden Forest, accidentally dropping her hat on the way, she later returned to Smurfy Grove and told her fellow Smurfettes about what happened. Unknown to her, Gargamel, Azrael and Monty were going to the Forbidden Forest to find her village and capture all its Smurfs. Later, she and the Smurfettes had surrounded Smurfette, Hefty, Brainy and Clumsy, believing they were threats, but then, the two girls recognized each other from the wall and Smurflily introduces herself, so does Smurfblossom.
Smurflily and her sisters take the Smurfs from Smurf Village to Smurfy Grove, when they meet Smurfwillow and discover Gargamel is going the wrong way. After Smurfstorm and Clumsy flew on Spitfire to check if Gargamel was still alive in the Swamp of No Return, Smurflily and her sisters welcomed Smurfette and her friends on Smurfy Grove hospitality, showing Smurfette their cultures. But later, they discover, thanks to Smurfstorm, that Smurfette was created by Gargamel to capture the Smurfs and late on night, the Smurfettes were preparing an attack against Gargamel once he comes and ended up meeting Papa Smurf. But Gargamel arrived and destroyed Smurfy Grove and captured all its inhabitants and Smurfette's friends.
Smurflily, alongside her friends, tried to escape and knock down Monty, but the plan failed as Gargamel and Azrael spotted them. After Smurfette sacrificed herself to save the Smurfs, ending up in her returning back into a lifeless lump of clay, all Smurfs both males and females met in Smurf Village to mourn for their loss, but their love for Smurfette had restored her back to life. So all Smurfs from both villages celebrated together in a massive dance party, Smurflily was seen dancing with an unnamed male Smurf and later with Handy.
Smurflily reappears in the 2021 TV series as a regular character who visits the Smurf villiage.
Her voice actress is Ariel Winter in the movie and Jackie Jones in the 2021 series.