Nightmare Gottschalk (ナイトメア＝ゴットシャルク) is a sickly dream demon who vomits blood frequently. He 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. 

When first introduced, Nightmare is both mysterious and suspicious, talking to Alice only in her dreams.  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, much to the annoyance of Gray (and Alice if she stays at the tower). 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.

Nightmare's voice should be a mid-low to low range.