Nightmare Gottschalk calls himself the personification of bad dreams. Despite his ill health, he refuses to go to hospitals because he hates hospitals and injections. He has the ability to read people's mind and enter their dreams. Nightmare is also the lord of the Tower of Clover and has a lot of subordinates. However, because his physical condition is bad, Gray usually does most of his work.
When first introduced, Nightmare is both mysterious and suspicious, talking to Alice only in her dreams. When the world moves to Clover, however, he is revealed to be a childish, lazy, and selfish person. He has a sweet tooth and likes cats and other animals (such as the baby seal he named "Gomakichi"), and he will skip work to sleep, keep warm, or escape into dreams whenever he is given the chance. Being sickly, Nightmare uses this as yet another excuse to avoid work. He reads the minds of everyone around even when they tell him to stop, making more of a nuisance of himself than anything. Despite all this, he is a very powerful and fearsome person when the need arises, and he is shown to be very kind to those he cares about.
He may be an incubus, but Nightmare is the most innocent of all of the cast. Intimate moments are usually disrupted by him getting embarrassed and/or coughing up blood; cuddling is his preferred form of expressing affection.
He has short, smooth silver hair that reaches just past his chin, and one (two?) grey eye(s). As it is a rule that he must always keep his right eye closed, Nightmare wears a black and gold eyepatch over it to keep it closed. When not in dreams, he wears a dark grey suit with a frilled white shirt underneath, and in dreams his outfit is less formal. One consistency about his outfits is the purple handkerchief that's always tucked into a pocket. Nightmare is described as having very pale, perfect skin and lips so pale they're almost purple; this is because of his bad health. [Source: wikia]
You can download this papercraft toy here: Heart no Kuni no Alice - Chibi Nightmare Gottschalk Free Paper Toy Download [Instruction]