Jack and Snuff:
Let’s see: crazy dude with a knife, cutting up the living in Victorian London, and named Jack? The Ripper himself, naturally. Also, of course, Snuff’s name is a dreadful pun.
Crazy Jill and Graymalkin:
A witch and the black cat that is her familiar – Graymalkin is also the name of the witch’s familiar in Shakespeare’s Macbeth. Graymalkin delights in being contrary about as much as Snuff delights in being loyal.
Morris & MacCab and Nightwind:
Little is known about this faction yet, but their use of mummy dust and exploits in a cemetary are suggestive of grave-robbery. They may be inspired by Burke and Hare.
Rastov and Quicklime:
A mad Russian monk and his snake – who lives in his belly. Most likely inspired by Rasputin.
The Count and Needle:
We don’t know much about them as yet, but really, some guy calling himself the Count? Could it be our old friend Vlad Tepes?
Owen and Cheeter:
Again, we don’t know much, but the old man harvests mistletoe and his companion is a squirrel, so he’s most likely a druid.
The Good Doctor and his servant:
We know little of them other than that the Doctor seems to be a mad scientist of some description – possibly Dr. Frankenstein? Now confirmed.
The Other Canine/Larry Talbot:
Larry Talbot is the human name of the Wolfman from the old Universal horror movies of the thirties and such. Which is to say: he’s a werewolf.
The Dour Detective and his Rotund Companion:
Surely you’ve already recognized Sherlock Holmes and Dr. John Watson? 
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