Sebastian Solace, also known as P-285 or The Shopkeeper, is a major hostile character in "Pressure," acting as an adversary in the Hadal Blacksite. He has a humanoid face with fish-like features: an anglerfish bulb on his forehead, fin-like appendages on his head, a fish-like mouth, and a third eye on his left side. His humanoid hands have four claw-like fingers. Sebastian's elongated body, similar to a sea snake, is covered in light blue scales and ends with a large tail fin.