Mariposa Diaz

Mariposa Diaz is Marco's baby sister who appears in the fourth season Star vs. the Forces of Evil.

While Marco was away on Mewni, Rafael and Angie decided to have another baby. Marco would not be aware of this until he and Star were invited to a baby-shower in "Marco Jr.". At they time, they were expecting a boy, but turned out to be a girl once she was born. Mariposa is very close to her brother, and by "Gone Baby Gone" becomes friends with Meteora Butterfly.

Trivia

 * Mariposa's name is Spannish for Butterfly.