As Elsa and Lucius are from different series, they have never met in canon. As well as the fact that Lucius is also a Pixar character.
Both Elsa and Frozone (Lucius's superhero title) are users of ice-related powers, through their hands and have used their abilities to run across a large body of water, as well as using them for other people than just for themselves. To keep innocent people safe from villains and to bring the magical joys of winter, even though a few of them were the main reason why Elsa and Lucius were forced to hide their ice abilities. As after Elsa lost control of them and accidently hurts Anna at a young age, her father tells Elsa to keep them a secret from everyone until she learns to control them again, while in Frozone's Pixar universe of superheroes, supers like him were made a illegal after a few caused some damage to property and got some bystanders hurt, who later sued them for their carelessness. The two also wear blue colored clothing, that are seen as their sigher clothes. Just as "Frozone" is Lucius's superhero title, the title of Elsa's Disney film is "Frozen".
When Anna asked Elsa to bless her marriage to Prince Hans, Elsa refuses and tries to tell her sister that she can't marry a man she recently met and that both of their time being isolated from the rest of the kingdom has left Anna with very little knowable about true love. While Lucius tries to help Bob Parr to understand that their hero days are over and that they could stop lying to their wives about what they secretly do to relive those days. Since the two were worried and concerned for them, as well as Elsa and Frozone excepting their forced to live lives. Until Frozone came out of hiding to help the Parrs save the city, along with him informing Bob and Helen of the one person that can help them make things right for supers again, along with Elsa realizing that love is what can thaw a frozen heart and uses that knowledge to bring back summer.
Similarities and comparisons
- Are two of the playable characters in Disney crossover games, like Disney INFINITY, Disney Emoji Blitz, Disney Magic Kingdoms and Disney Heroes: Battle Mode.
Elsa and Frozone are two of the main members in the Secret of the Incredible Frozen Guardians crossover fandom, with Jack Frost from Rise of the Guardians and Periwinkle from Disney's Fairies. As well as them being apart of the expanded ice character fandom, Just-Ice League, where Mr. Freeze from DC Comics, Iceman and Loki from the Marvel universe, The Ice King from Adventure Time and Jack are all seen as Frozone's love rivals for Elsa's affections.
In some Superhero AUs of The Incredibles universe, Elsa is commonly seen as Frozone while he is portrayed as her or is placed in Elsa's blue dress, for fun, in a Frozen AU.
Since Disney's princesses are a few of the main Disney cameo characters within the internet world from Ralph Breaks the Internet, where an netizen version of Elsa is one of them, and a few netizen versions of Pixar characters were briefly seen in the Disney crossover film, it could have fans of the ship feature a fanon netizen version of Frozone with netizen Elsa. As a friend or lover.