A "pissrat," huh? Based on the name alone, I’d imagine it's some sort of grungy, street-smart rodent that thrives in the darker, grimier corners of the world—like sewers, alleyways, or even those sketchy parts of the city that everyone avoids. It probably has a reputation for being tough, scrappy, and not afraid to get dirty (literally). I picture it as a slightly comical but gross creature, maybe covered in filth, with an intense, aggressive personality—like a rat that's lived through all the nastiness and came out even more resilient (and a little more gross) for it.