Arianna tells Rapunzel that, at a young age, she was very much like her daughter in that she felt lost in the world and longed to find her calling. During this time, she lived her life as an adventurer, exploring remote continents, besting violent storms and helping local villagers restore their worn homes. At some point, she would meet Frederic, marry him, and assume the role of queen.
Arianna makes multiple appearances in the TV series, though she usually plays fairly minor roles. When focused upon, however, it is shown that Arianna is just as elated as her husband to have Rapunzel in her life again, but not in a manner that has made her overprotective. Instead, she supports her daughter in all endeavors, and looks to make up for the eighteen years worth of lost time by spending time with Rapunzel whenever she can. She trusts that her daughter can make her own choices and believes in her ability to accomplish her goals.
In "The Way of the Willow", it is revealed that Arianna has a younger sister named Wilhelmina (nicknamed "Willow"), who visits Corona in honor of her sister's birthday—despite having missed the previous six. Unfortunately, Willow's visit had cut into Arianna and Rapunzel's planned date to watch a meteor shower, which Arianna looked forward to as a chance to have some long-awaited quality time with her daughter. Tidbits on Arianna's past were also hinted at throughout the episode, such as the fact that — during her childhood — she had a somewhat crippling eagerness to impress those around her, which would result in her taking any dare that Willow threw her way; Arianna was notably embarrassed by this when Willow brought it up.
In the season one finale, Arianna tried to reason with her husband about him locking Rapunzel up in her bedroom tower was too extreme. When she couldn't change his mind she visited her daughter and reminded her that her father was doing this because he cared.
In the episode "Secret of the Sundrop", Varian distracts the guards and kidnaps the king. He later reveals the king is just bait to lore Rapunzel to his lab. When Queen Arianna and Rapunzel come, Varian shows them the king, alive and unhurt. Rudiger helps release the king, who throws a sword to Arianna, who is chained up and would have soon be trapped in the amber that trapped Qirin, Varian's father. Arianna uses the sword to cut the chain and escapes. Varian later grabs the queen and Cassandra in a giant automoton-ike robot and starts to crush them. However, a black rock trips his robot, which falls backwards and Cassandra and Queen Arianna are released.
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