As I mentioned in an earlier thread, Legend/MRQ could really use a standard ophidian race, and it is odd it doesn't have one, given how common these creatures appear in fantasy lit. I cobbled together a stat block for Snakemen fusing those from CoC with the Bestiary snake description, Bite and Constriction damage. Not sure if my SIZ and hit locations are optimum. It would be good to see some "official" treatment.
Also, a Deep One clone able to dodge the Khoppi Rites issues. It's always great to have a croaking army of these slithering and flopping on to the players' boat in the darkness.
EDIT: Also Morlocks or Molemen, or some other blind and blundering, murderous subterranean menace.