Vampire Dragons are members of the undead. They sustain themselves by drinking the blood of others. It is said that they are only “alive” at night, and seem dead or asleep during the day, as they cannot endure sunlight for long periods of time. Vampire Dragons can only reproduce by changing the eggs of other dragons, puncturing the shell with their fangs and injecting venom that kills the baby inside.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Kaito Lord Of Darkness is somewhat of an odd character, sometimes referred to as 'the strange one in the Vocaloids' by those that have not experienced how bizarre the Kagamines can be. Although, as is usual for Vampire dragons, he can be serious and dark—something reflected in his songs—Kaito can also occasionally be very cheerful, bordering on the hyperactive at times. For example, he shares OMG A Double Rainbow's love of rainbows, and a sure way to bring out his hyper side is to find him one. He also for some reason is obsessed with vegetable juice, which is truly weird for a vampire who spends much of his time drinking blood. When not singing with the other Vocaloids, Kaito hangs out with his fellow Vampire Dragons and with Dracopenguin, the scrollkeeper. He also spends time with Kaito's Judgement Of Corruption, a Hellfire Wyvern officially assigned to be his servant but who has earned a firm place in his circle of friends.