The Old Styx (called this because of his advanced age) is one of the rulers of the Styx. He makes appearances in each of the books as a prominent antagonist. He is the father of the Crawfly, and the grandfather of the Rebecca Twins. As the head of the ruling Styx family, he is a member of the Styx Panoply Council and is possibly its leader. He is usually accompanied by his young assistant, and has an office in one of the upper levels of the Styx Citadel. True to his name, his skin is wrinkled and yellowish like old parchment, and his black hair is streaked with grey.