The animated series Star vs. the Forces of Evil features a number of characters created by Daron Nefcy. It follows the adventures of Star Butterfly, heir to the royal throne of the dimension of Mewni, who is sent to Earth so she can complete her education and learn to be a worthy princess; and Marco Diaz, a human teenager. As they live their daily lives, go on adventures in other dimensions, and, in the first season, try to prevent the evil Ludo and his minions from stealing Star's magic wand.

Overview Character Voiced by Appearances First Season 1 Season 2 Season 3 Season 4 Main characters Star Butterfly Eden Sher "Star Comes to Earth" colspan="4" Marco Ubaldo Diaz Adam McArthur colspan="4" Supporting characters Buff Frog Fred Tatasciore "Star Comes to Earth" colspan="4" Jackie Lynn Thomas Grey Griffin colspan="4" River Butterfly (né Johanson) Alan Tudyk colspan="4" Moon Butterfly Grey Griffin colspan="2" colspan="2" Glossaryck Jeffrey Tambor rowspan="2" colspan="2" rowspan="2" rowspan="2" Keith David "Conquer" Pony Head Jenny Slate "Party With a Pony" colspan="2" colspan="2" Tom Lucitor Rider Strong "Matchmaker" colspan="2" Eclipsa Butterfly Esmé Bianco "Crystal Clear" colspan="2" Janna "Banana" Ordonia Abby Elliott "Star Comes to Earth" Globgor Jaime Camil "Conquer" Hekapoo "H-Poo" Zosia Mamet "Page Turner" colspan="3" Antagonists Ludo Avarius Alan Tudyk "Star Comes to Earth" colspan="3" colspan="1" Toffee of Septarsis Michael C. Hall "Fortune Cookies" colspan="2" Meteora Butterfly Jessica Walter "St. Olga's Reform Schoolfor Wayward Princesses" rowspan="2" rowspan="2" rowspan="2" rowspan="2" Bryana Salaz "Gone Baby Gone" Mina Loveberry Amy Sedaris "Starstruck" colspan="2" colspan="2"

Main characters Star Butterfly

Princess Star Butterfly (Voiced by Eden Sher) is thought to be a magical princess from the dimension of Mewni. On her 14th birthday, she is given the family heirloom - the royal magic wand - but after she causes a big accident, she is sent to the Earth dimension as a foreign exchange student. She then lives with the Diaz family. She enjoys exploring and being away from her parents and their pressure to make her into a perfect princess.

Nefcy had originally designed Star as a fourth-grader obsessed with Sailor Moon and wanting to become a magical girl despite not having any powers. The design was initially just her with heart cheeks, and the devil horns came later. By the time she pitched the idea to Disney, she had made the character older, and an executive suggested she would have actual magical powers, leading to the current foreign exchange student concept. Nefcy says Star is very much like her and that she has a lot of flaws and aspects of being a real girl. Star is Eden Sher's first voice acting role. Sher describes Star as Disney's first-ever butt-kicking princess and identifies with her a lot: "She's always wrong. She's always messing up. But at the same time, this character has such a good heart. Star is fiercely loyal when it comes to her friends and never backs down from a fight. There's so much going on there. And that's what makes this character so much fun to voice."

Disney sitcom actress Olivia Holt dressed up as Star during the live-action promotions of the series weeks before its Disney XD premiere. Star wears a sea green dress with a pink octopus on the front and magenta and orange striped leggings as well as purple boots with a rhino design. She also has a small yellow Star shaped bag with a face on it and wears a magenta devil horn headband on her head. Star has long blonde hair that goes down to her knees. She has many outfits. For example, in the episode, "Star Comes to Earth", she wears her very beautiful princess dress that originally fits the personality of a girly girl, including a gold tiara on her head, an elegant blue dress with puffy light blue sleeves with dark blue strings around them, a medium blue vest with a darker blue trim and gold buttons, a blue puffy skirt with light blue ornaments and two strings with several hearts, white socks and a pair of very shiny dark blue shoes with light blue puffs on her toes. It was the very first outfit, that Star Butterfly was wearing. Despite its few appearances in the series, her blue puffy princess dress is Princess Star Butterfly's most highly iconic outfit, among her several fans.

Marco Diaz

Marco Ubaldo Diaz (voiced by Adam McArthur) is Star's best human friend, later becoming her boyfriend. Prior to meeting Star, he was known as a safe kid. He is of mixed Caucasian and Hispanic descent, and typically wears a red hoodie, having said that he owns a dozen of them. He helps Star during their fights against the villains using mostly martial arts moves from training in a karate dojo. He's had a crush on classmate Jackie Lynn Thomas since kindergarten; in "Bon Bon the Birthday Clown", they start dating, but end their relationship later on in "Sophomore Slump".

In "St. Olga's Reform School for Wayward Princesses," he dresses up as a princess in order to retrieve Pony Head, but ends up starting a women's rights movement, of which he is known as Princess Marco Turdina. His success results in him getting regular royalty checks of 650 dollars, the cash being used as a running gag in multiple episodes in Season 2. In "Running with Scissors", Marco psychologically ages 16 years in Hekapoo's time-dilated dimension, wherein two years pass for every minute on Earth. Subsequently, in the season 3 episode "Marco Jr.", it was confirmed that both Marco himself and his friends and family view him as being "26 to 35" years old. As his "Turdina" persona, he has developed a love for makeup.

Nefcy originally conceived of Marco to be a child obsessed with Dragon Ball Z and karate. After Star's character was changed to be a foreign exchange student, she felt Marco's character needed to balance out Star's, so he became more of a straight man yet is still quirky. Some of Marco's character was based on Nefcy's husband (filmmaker Bobby Miller). She likes that McArthur portrays him away from being nerdy or unlikeable and that Marco is smart and thoughtful. McArthur said that he felt really connected to the character, as he has a martial arts background, and when he was younger he had two best friends that were girls.

Supporting characters

Moon Butterfly Queen Moon Butterfly (voiced by Grey Griffin (adult) and Katie Driver (young)) was the Queen of Mewni and Star Butterfly's mother. As a teenager, she succeeded to the throne and leadership of the Magic High Commission when Toffee killed her mother (and Star's grandmother), Comet Butterfly, during his attack on Mewni. She made a deal with Eclipsa to learn dark magic, but used it to sever Toffee's finger instead upon realizing that the price of its use was too high. Her experience made her overprotective of Star at times while ruling with a calm, steady, and thoughtful hand. Moon is shown to be a resourceful and capable fighter in her own right, with powerful magical abilities, experienced horsemanship, keen senses and extensive knowledge of the geography and history of Mewni.

After eventually learning that she and Star are of Pie Folk descent and accidentally wounded by Eclipsa when forced to harm Meteora, Moon ends up in the magic dimension and loses her memories. Despite Star's attempt to save her, she retains her amnesia upon being sent back to Mewni by the dimension's guardian, Firstborn. Moon returned to Mewni as Pie Folk, who then exploited her amnesia to bake their pies before Star saves her mother. Moon regained her memories shortly after and ultimately decided to live in the forest, due to her mistrust of Eclipsa, with River and the other Mewmen who had lost their homes under Eclipsa's rule. It is later revealed that Moon ordered Rhombulus to free Globgor and created Mina's army of Solarian warriors to take back the crown. While Mina intends them to exterminate all "monsters", including Eclipsa and her supporters, Moon wishes merely to take the throne and send Eclipsa, Globgor and Meteora into exile. She later regrets it when Mina rebels against her in order to carry out her own plan.

River Butterfly King River Johansen-Butterfly (voiced by Alan Tudyk (adult) and Sonny Ashbourne Serkis (young)) was the King of Mewni and Star Butterfly's father. A member of the Johansen family, he married Moon and took her family name. The Johansens are portrayed as rough, Viking-like barbarians fond of the outdoors and fighting who allied with the forces of Mewni in the war against the lizards led by Toffee. River is of a stout, broad physique, sports a full beard, and is fond of wearing no clothes other than a loin cloth made of leaves. He is shown to be physically strong and a relatively bold, inspiring military leader, but was a poor administrator when left in charge of Mewni in Moon's absence. Following Eclipsa's accession to the Mewni throne, River assists his wife in supporting displaced Mewman residendts.

Diaz family Rafael and Angie Diaz (voiced by Artt Butler and Nia Vardalos) are Marco and Mariposa's parents. Angie is white, and Rafael is Hispanic. According to the Guide to Mastering Every Dimension, Rafael was born in Jalisco, Mexico. They hosted Star while she was on Earth. Fully aware of Star's magical abilities and other-dimensional origin, they are nonetheless casual about Star and Marco's adventures through time and space, even enthusiastic at the prospect of their son being more adventurous and less of a "safe kid." They are very supportive and nurturing of Marco, with the whole Diaz family sharing enthusiasm for activities such as traveling, hosting foreign students (having hosted a Swedish boy previous to Star), cooking and art. Their casual approach with Marco has led to them somewhat losing touch with their son, unaware of the 16 years he spent in Hekapoo's dimension until Star informs them and deciding to have another child, which they first named Marco Jr., while Marco is living in Mewni. The baby turns out to be a girl named Mariposa, who later gets trapped in the Neverzone dimension with Meteora and grows up to be a teen (voiced by Isabella Gomez).

Principal Skeeves

Skeeves (voiced by Jeff Bennett) is the principal of Echo Creek Academy. He is very emotional and acts more like an immature student at the school than its principal. He casually mocked Marco as the "safe kid" and unhesitantly accepted Queen and King Butterfly's bribe to let Star attend the school. He was inconsolable after Star destroyed the statue of the school's possum mascot (as was the rest of the school, much to Star's confusion) and is generally shown being concerned with anything but students' education.

Ferguson and Alfonso

Ferguson O'Durguson and Alfonso Dolittle (voiced by Nate Torrence and Matt Chapman) are Marco's two friends at Echo Creek. Ferguson has orange hair and enjoys making belly faces. Alfonso has curly hair and wears glasses. They appear mostly in early episodes of season 1, and begin to disappear during season 2 which Star herself mentions in "Collateral Damage" where she declares that she has not seen them all year. They make a brief appearance in season 3 where they have become visibly annoyed at Marco's constant references to his adventures with Star and see him off when he decides to leave for Mewni. In season 4, they reaffirm their friendship with Marco and reveal that they have made new friends with four rather handsome looking teens who have become part of their D&D group.

Starfan13 Starfan13 (voiced by Daron Nefcy) is a fangirl with a big obsession over Star Butterfly. She often tries to mimic Star's appearance and interests, like copying her favorite color.

Ludo's minions