Name: Zero (Patient Zero)
Age: Unknown
How long they've stayed: First and ONLY resident  the ONLY medical building built by humans..
Gender: Unknown
Universe: Not Clear..
Species: Human?
Looks:

Scenario #1: After somehow getting yourself a broken arm (or other corresponding limb), you decide to make your way to the ONLY hospital with medical supplies left...

Scenario #2: You decided to explore some human architecture... sadly, the old, creepy hospital was one of the few human buildings left...