Originally part of a mob family, she joins WITSEC with her family after testifying against them and becomes a supportive maternal figure to Charlotte.

Harriet's supportive husband who assumes a new identity with her in WITSEC, becoming a stable father figure to Charlotte.

The young son of Harriet and Jonathan who initially struggles with the changes brought by WITSEC and Charlotte's presence in his family.

A humorless US marshal assigned to the Trevor family who gradually comes to appreciate Charlotte's efforts to protect them.

A supportive US marshal with a friendlier demeanor who helps ease Charlotte's transition into WITSEC.

Elena's brother and a family assassin, known for avoiding conviction and tracking down his sister's family.

Charlotte's best friend at school, known for her shyness and computer skills, who becomes aware of Charlotte's secret.

An active and bubbly student council president who befriends Charlotte during her time at school.

A seventh-grade "mean girl" who dominates a group and tries to undermine the school election process.

An athletic student interested in Charlotte, who inadvertently puts her family at risk with his actions.

Charlotte's biological father, a career criminal with a complicated relationship with his daughter.

Brit's nosy mother who becomes more appreciative of her daughter's talents through Charlotte's influence.