After Big Hero 6 was released on November 7, 2014, ten years after the Incredibles was released on November 5, 2004, many fans have decided to do a crossover of the Incredibles and Big Hero 6. Usually, the fans decide to move the events of the Incredibles to the present time events of Big Hero 6 so that the Incredibles can team up/cooperate with the Big Hero 6 team in full health. Thus, some shippers in some cases consider having Hiro and Violet interact with each other due to both being the same age, saving the world together as superheroes, and can have a personal connection with each other. Other fans either see Violet and Hiro as siblings or just friends.
It is well known that Dash always teases Violet about some certain boys she likes for example, Tony Rydinger in the original movie, and Wilbur Robinson in the Willet pairing in the fandom; as a result, making Violet annoyed with her brother's teasing. It is no exception in some crossover/fanfics that involves The Incredibles and Big Hero 6 altogether, Dash will tease Violet about Hiro this time, thus making her more upset, shy, or slightly embarrassed.
Both Hiro and Violet have double lives such as going to school/college, which Hiro graduated High School at the age of 13, and having to be teenage superheroes who adventures build up to more confidences. Both can stand up for each other whenever problems occur in their ways when they face obstacles/villains that come their way, such as when either Hiro or Violet faces danger, both are determined to protect each other from whatever harm comes their way.