The rat in the pantry. Actually, what's left of it when McTavish is done clobbering it.
Eli Filch, in general. A filthy, leering, rotten-mouthed pig of a young man who knows he can get away with just about anything. One glance from him leaves Clara Grace feeling like she needs a shower... only he would probably be watching.
Any of the boardinghouses and waterfront dives frequented by the Longhope crew.