(yeah i added him:) )
Sebastian, full name Sebastian Solace[1] is an NPC that can be found in-game, but will not enter the elevator.   

Sebastian's body is elongated with light blue scales, similar to that of a sea snake. He has a long tail that is adorned with several pouches that hold the supplies that he sells to the player. At the end of his body is a large tail fin. He has three arms, one of which is attached to his left side and is wrapped in a bloodied bandage. His hands are humanoid, yet only have four fingers and are claw-like. Sebastian's face retains a humanoid appearance with fish-like features, such as an anglerfish esca on his forehead, fin-like appendages in place of ears, a fish-like mouth, and a third eye on his right side. He has black, short, wavy hair.

He wears a dark brown jacket with a white undershirt and white jabot. He also wears various belts and accessories such as a holster with a gun, a portable SCRAMBLER device, and a small pin with a photo of a cat on it.   
https://www.youtube.com/watch?v=XlF1oRD1Qx0 -his voice!!

-Wiki on REGRETEVATOR   https://regretevator.fandom.com/wiki/Sebastian 
-Wiki on PRESSURE https://pressure.fandom.com/wiki/Sebastian_Solace