<Ul> <Li> Mr. and Mrs. Diaz (voiced by Artt Butler and Nia Vardalos)--Marco's parents who host Star while she is on Earth . Their given names are Rafael and Angie . </Li> <Li> Pony Head (voiced by Jenny Slate)--Star's best friend from Mewni and a floating unicorn head . She is described as sassy, sarcastic, and mischievous . She does not get along with Marco and is sometimes jealous of him when he interacts with Star . Nefcy said that Pony Head originated from an early story of Star where the latter was a fourth - grader and was discouraged during her attempts to recover a stolen bike; an image of Pony Head appeared and told Star not to give up . </Li> <Li> King Butterfly (voiced by Alan Tudyk)--Star's father and the king of Mewni . His given name is River . </Li> <Li> Queen Butterfly (voiced by Grey Griffin)--Star's mother and the queen of Mewni . Her given name is Moon . </Li> <Li> Ludo's minions - They are monsters that are mostly anthropomorphic mixes of animals and / or human appendages . Some of them are occasionally spotlighted in an episode . They include Beard Deer, Bearicorn, Big Chicken, Boo Fly, Buff Frog, Lobster Claws, Man Arm, Spike Balls, and Three - Eyed Potato Baby . They serve Ludo in the first season, but go their own ways in the second . Buff Frog has made multiple appearances in the second and third season as a Russian - accented father of some tadpoles who allies with Star and Queen Butterfly . </Li> <Li> Ferguson and Alfonso (voiced by Nate Torrence and Matt Chapman)--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 only appear in one season 2 episode as off - screen voices . </Li> <Li> Miss Skullnick (voiced by Dee Dee Rescher)--Star and Marco's homeroom and math teacher at Echo Creek Academy . She is accidentally turned into a troll by Star in the episode "Match Maker" and then retains her form for the remainder of the series . Her given name is Margaret . </Li> <Li> Jackie Lynn Thomas (voiced by Grey Griffin)--A skateboarding classmate who has been Marco's crush since kindergarten . She and Marco start dating in the season 2 episode "Bon Bon the Birthday Clown ." </Li> <Li> Dojo Sensei (voiced by Nick Swardson) - The unnamed sensei at the dojo that Marco attends . </Li> <Li> Oskar Greason (voiced by Jon Heder) - An Echo Creek student who is Star Butterfly's crush . He is usually seen playing on a keytar or in his car where he also resides . Principal Skeeves distrusts him as he has a "record" when Star asked about him . </Li> <Li> Tom (voiced by Rider Strong) - A hot - headed three - eyed demon from the Underworld who is Star's ex-boyfriend . </Li> <Li> Glossaryck (voiced by Jeffrey Tambor)--A gnomish sprite with blue skin and a white beard . He lives inside Star's magic instruction book and sometimes speaks in riddles . </Li> <Li> Toffee (voiced by Michael C. Hall)--A reptilian humanoid villain . First appearing in "Fortune Cookies," he joins Ludo's gang as an evil efficiency expert--though Toffee has his own agenda . Nefcy said that she and her staff "wanted Star to fight against somebody who is a greater evil", as Ludo was "super fun" but "not a scary villain". In the season 2 episode "The Hard Way", he possesses Ludo's body and takes over Mewni in the TV movie "The Battle for Mewni". </Li> <Li> Janna (voiced by Abby Elliott) - A mischievous student who hangs out with Star and Marco, having a larger supporting role in season 2 . She breaks into Marco's locker and knows all sorts of his personal information . </Li> </Ul> <Li> Mr. and Mrs. Diaz (voiced by Artt Butler and Nia Vardalos)--Marco's parents who host Star while she is on Earth . Their given names are Rafael and Angie . </Li> <Li> Pony Head (voiced by Jenny Slate)--Star's best friend from Mewni and a floating unicorn head . She is described as sassy, sarcastic, and mischievous . She does not get along with Marco and is sometimes jealous of him when he interacts with Star . Nefcy said that Pony Head originated from an early story of Star where the latter was a fourth - grader and was discouraged during her attempts to recover a stolen bike; an image of Pony Head appeared and told Star not to give up . </Li> <Li> King Butterfly (voiced by Alan Tudyk)--Star's father and the king of Mewni . His given name is River . </Li>

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