Molly Costello

Molly Costello was the original Rebel Knights in the first season of the series. She attended Santo Domingo High School, along with her younger sister, Cleo. She was a cheerleader and a friend of Zoe Parker and Natalie Callaway. She was killed in battle by Lord Dreylock in the season finale episode, Sacrifice. A month after her death, her friend Natalie gave birth to her daughter, whom she named after Molly.

The Aftermath of Molly's Death
After Molly's death in battle, the Knights put aside their grief when her sister, Cleo leaves the school with an arsenal of rifles and grenades to seek revenge on Dreylock. Five of the knights; Violet Adams, Zoe Parker, Barrett McIntyre, LaShawn Deveraux, and Diesel Turner leave their base to search for Cleo before her quest for revenge gets her killed. Two of the knights Grover Jones and Natalie Callaway stayed behind due to Natalie being pregnant at the time and Grover promised Diesel that he'll look after her. With help of new friends, Cassie and Caitlyn Flores, the knights search for Cleo in their neighborhood. They stayed at a house when it started raining in town.

Trivia

 * Molly was a cheerleader at Santo Domingo High and was a shoo-in for head cheerleader against Zoe Parker.
 * Despite being popular, Molly had a soft caring side.
 * She was very overprotective of her younger sister, Cleo.
 * She promised her mother before the invasion that she would look after Cleo.
 * She dies one week into the invasion and into her role as a Rebel Knight.
 * Knowing she is going to die anyway, she allows herself to get shot by Dreylock's pistol in order to save Cleo.
 * Before her death in Sacrifice, Molly had become an fiercest Rebel Knight fighter.