A Red Nocturne has a smooth, conical, red body with a Heartless emblem emblazoned on its chest. The top of its body flares outward and forms a jagged "collar" below the Heartless's spherical, pitch black head. It also wears a conical, yellow hat that has a jagged brim and a thin, curled tip. Like many Heartless, the Red Nocturne has glowing yellow eyes. Its seemingly useless feet sport three small, thin toes.
Like other Heartless in its family, the Red Nocturne's name is comprised of a color—in this case, red—and a musical term—in this case, a nocturne, which is usually a musical composition that is inspired by, or evocative of, the night.
Red Nocturnes utilize Fire magic, although they treat it very much like Blizzard magic in the way that they shoot it. And, in compensation, they are weak to Blizzard magic, as casting it brings about a large amount of damage, along with two (eight after rescue) Tech Points. Because they are Fire-like enemies, they absorb any kind of Fire spell cast upon them by any party member.