User blog comment:WarrenWitch/A Grimm Situation/@comment-9090085-20140930051539

The way I see it, there are 2 main reasons the CoG seem so non-threatening:

1) Numbers. The CoG have seen thus far in tiny groups, and the Grimm originally had absolutely gigantic numbers monsters to throw at humanity in great swarming attacks.

2) Runts. The CoG that have appeared in-series are the weakest varieties of monsters around. That, and they're also the "runts of the litter"(for example, it is subtlety implied that the "Giant Nevermore" in Players a Pieces is actually a "Little Nevermore"). Plus, I remember the RWBY Crew mentioning that they were going to later add CoG based directly after mythological creatures rather then animals(the Nevermore is described as "dragon-like" but is obviously a crow).

In other words, I feel we've only seen the tip of the iceberg of both the CoG's individual strength and their numbers. As for how they they could show off some of that "true strength":

1)Quantity. Have RWBY be swarmed by hundreds of Grimm seen thus far(and/or dozens of the "larger" types, which Oobleck might fight), and have do well at first; only to fast forward 6-12 hours to show them so tired that even lowly Beowolves are beating them up.

2)Quality. Have a new type(or new size) of Grimm that utterly ROFLstomps RWBY, forcing Oobleck to save them - and then have a dozen show up later(not that I see this happening this volume, but it could happen).

3)Death. Have the CoG kill people. I don't really see them killing a named character this early, but I can see them massacring an entire village - perhaps even doing so while RWBY protects the village.

(Of course, those three ways can be combined, too)

As for what new type of Grimm I'd like to see(besides Dragons, cause that's obvious)? a Hydra: a dozen heads, lashing out in all directions? that's always going to be dangerous.