Star Butterfly vs. the Forces of Evil

Description of the series
Star Butterfly is the heir to the royal throne of the dimension Mewni. After she accidentally sets fire to her family castle, her parents, King River and Queen Moon Butterfly, send her to Earth as a "mild" punishment for careless wielding of her magic wand. On Earth, Star meets the Diaz family and begins a semi-normal life in the town of Echo Creek, attending school and meeting new friends.
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Over the course of the series, Star and her friend Marco Diaz travel through exotic dimensions using dimensional scissors and encounter new enemies. The plot shifts from protecting a magic wand to a larger narrative focusing on conflicts related to prejudice against monsters, the rule of Mewni, the origins of the dimension, and the nature of magic.
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At the end of Season 4, Star destroys magic in the "space and dimension" of "Mewni-Earth".
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Main Characters
Star Butterfly is the main character, a teenage sorceress, princess, and, starting with the episode "Divide," the temporary queen (regent) of the dimension Mewni. Energetic, kind, and loves to help others. Over time, she begins to sympathize with monsters. She owns the royal magic wand, which grants her numerous magical abilities.
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Marco Diaz is a teenager, a student at Echo Creek Academy, and Star's best friend. A kind, organized, responsible person, always ready to support his friends. He practices karate (he holds a green and later a red belt), which helps him fight monsters. At the end of Season 4, he begins a romantic relationship with Star.
Minor Characters
Moon Butterfly is the Queen of Mewni and Star's mother. She is a very powerful sorceress and a member of the High Commission. She possesses powerful magical abilities and is skilled in horseback riding. Come up with a story.*