Varian

Varian is a young alchemist from the Kingdom of Corona who appears as a recurring character in Tangled: The Series. He later serves as the main antagonist for the latter half of the first season. Hailing from Old Corona, he was an ambitious alchemist proficient in sciences attempting to impress his father and his friend/crush Cassandra. But his father ended up getting trapped in indestructible ember of Sun-Drop magical origin, and he tried to enlist Rapunzel for help, but because she was too preoccupied with helping her kingdom from a winter storm, he was escorted out leaving his father frozen. Betrayed and feeling Rapunzel broke her promise of everything being fine, he swore to get revenge on the kingdom. He manipulated Rapunzel into committing treason just to get the Sun-Drop Flower to free his father, and then baits Rapunzel into arriving by kidnapping her mother. When both attempts fail, his frustration makes him wreak havoc in an automaton mech and eventually be arrested for his crimes, with King Frederic promising to help free his father.

Role in the series
Though Varian is still imprisoned, he still has good in him, as even someone like the former Uniter Princess Lady Corona sees it, as she feels sorry for him because she went through a similar experience that made her learn the Hurt Incantation. After learning Varian had clues to the location of a Keyblade that could pose a threat to the UUniverses, she manages to bring out enough good in him to allow him to help, despite him still being vengeful and hateful.