This is Barneby, the most recent addition to Giles group. This mangy cat is responsible for keeping Giles in supply, though the hooch he brings in is naturally subpar, and is usually referred to as, "bleeping river water."
Barneby himself is not the most stable of individuals, and tends to concern those around him with his inability to understand most, and his apparent desperation for companionship; add that in with his off-putting grin, and his bizarrely chipper attitude, and you have a pretty undesirable individual.