Nick is a demon with long red horns, which curl back in the middle, and a long red tail with an arrowhead tip. Like other demons, he has goat-like ears. His hair is semi-long, chiefly kept tied back in a braid, and his eyes are golden, the same colour as his half-brother Neil's. He also has a small amount of stubble on the chin. At first he appears to think only of himself, but he actually is just a bit oblivious and struggles to understand the point of view of those around him.

(Source: All Saints Street Wiki)