|First appearance||"Swiss Miss"|
|Voiced by||Nika Futterman|
|Occupation||Kidnapper for El Frente Rojo|
Sia (voiced by Nika Futterman) is one of three known members of El Frente Rojo. She dated a pair of twins who were also members of the same group. She first dated Carlito, but left him for his unnamed twin. After that brother was severely burned, she left him and went back with Carlito.