Kaible
A 7-foot tall monster with silver claws, blue eyes, big horns, and a holy symbol. In human form, it's Greg Marx, who is fast but short and not strong.
Greg Marx is like a demon who can't even do a sit-up.
He ran past me like a demon, but he tripped on a pebble.
He's a demon, but he can't even carry his own backpack.