Guinevere Copeland is the 2nd in command of the Crimson Bloods.
Maddy Wort, the actress who plays Guinevere in the series, wrote a description of Guinevere.
"Guinevere doesn't quite know what happened to her. She never knew her mum and was adopted by Skye's family. As Skye became an Azure and Guinevere became a Crimson, they suddenly became enemies, even though they were so close when they were humans. Even though she knows she shouldn't, she's falling in love with Ace Fillmore, an Azure Blood, Skye's boyfriend. Guinevere has some unexpected obsessions, such as drama, dance and art. They all remind her of her human life." - Maddy Wort