Originally raised as Princess of the dimension of Mewni, Star is a teenage girl who loves action, adventure, and near all things girly and cute.  She was relocated to Earth by her parents to try to tame her wild side and befriended a boy named Marco Diaz who's family also took her in while she stayed on Earth.

Overtime, she realized her people and the monsters living in Mewni were not so different and monsters were actually being mistreated and not the evils she was raised to believe.  With this, she began working towards making Mewni a better place for both Mewmans and Monsters alike.

Star has a big heart and strong morality, and she works towards making things fair for everyone she can, though she can be reckless at times as well.