Katana and River Graves are vixens, daughters of Bernie Graves, and Jenni's cousins. Katana has beige and cream fur, black ears and tipped tail, and silver eyes. She wears a red shirt with the middle parts of the sleeves cut out, black shorts, and shoes, and gloves. River has brown and beige fur, blue eyes, and normally wears a gray shirt with a white lab coat and goggles.

Katana and River Graves were born to Bernie Graves alongside their brother, Hexter. When their father died, they were sent to live with their maternal grandparents. Katana and River both are devastated upon learning their uncle and aunt are dead. Led by Hexter, the siblings find and reunite with their cousin, Jenni. Overtime, Katana trains with Jenni on her fighting skills to hopefully one day find the killer of her uncle. River studies to become a scientist. The cousins go their separate ways and reunite years later with Katana and River join the Graves Gang.

Katana is a bold, spunky, sassy, and tomboyish individual who doesn't take orders well and is willing to smack talk a person of higher authority just for laughs. River is more secluded, respectful, and shy but always seems to go with what her sister is saying.

Trivia:

Katana and River appear to be the only female foxes in the Graves family.

Upon their first meeting, Katana identifies Mordecai as his alias Elijah Metzger. She states she had been hunting him but Jenni persuades Katana that Elijah was merely another person who looked like him. It is unknown if Katana really believed Jenni or she was just letting him off the hook for her cousin's sake.