Bast

Bast—or Bastet—is the Egyptian Cat Goddess, typically appearing as a woman with a cat's head, though she can appear as a regular person or a regular cat (large or small) as well.

Children of Yog-Sothoth

The Children of Yog-Sothoth—previously Sons of...— are the result of Yog-Sothoth mating with a human female. The most famous of these progeny are Wilbur Whately and his twin brother from The Dunwich Horror, in which instance one was born as a mutated human while the other was a giant, invisible monstrosity.

Hounds of Tindalos

The Hounds of Tindalos live in the distant past, when life was still single-celled. They have the ability to use the angles of the world as portals, travelling through both time and space. If a person becomes known to a Hound, it will hunt them relentlessly.

Denizens of S’glhuo

The Denizens of S’glhuo are beings composed of sound, though they appear thin and tall, with huge pupilless eyes, and a skin covered with tiny, rippling blue scales. Their fingers are boneless.

Hunting Horrors

Hunting Horrors look like large, flying serpents—or perhaps, legless dragons.

Gnoph-Keh

Gnoph-Keh—not to be confused with the deity Gnophkehs—are hairy, six-limbed creatures a bit bigger than a polar bear. They are a sparse race, associated with Ithaqua. Usually only one Gnoph-Keh is encountered at a time, and the race is generally restricted to glaciers, ice caps, and extremely cold and icy areas.

Dholes

Dholes are basically giant worms. And I do mean giant. They are the largest creature in the Malleus Monstrorum, including deities. It's said that there are none on Earth, which can only be a good thing, because they burrow through the ground, infesting the entire planet until it is destroyed.

Dark Crawlers

Dark Crawlers are new to the 7e Malleus Monstrorum, though besides a slightly altered description, are identical to Tunnelers Below from the previous edition. They are four-metre long cylinders with a lamprey-like mouth full of needle-like teeth. They are telepathic and live in tunnels that span the globe.

Star-spawn of Cthulhu

Cthulhu's spawn are basically just smaller versions of himself. Some were trapped in R'lyeh when it sank, though many were not.

Chakota

The Chakota is a six-foot-tall worm-like mass of sickly purple-veined muscle covered in dozens of human faces that weep, shout, and cry out with great woeful feeling.

Adherents of the Unspeakable Oath

Adherents of the Unspeakable Oath (previously called Unspeakable Possessors) are creatures created by Hastur when it collects on a binding oath known as the Unspeakable Promise. Adherents have grey-green, scaly skin, with a bloated parody of a body. Their limbs also become boneless and fluid, like an octopus'.

Spawn of Abhoth

Abhoth is constantly creating spawn, many of which are reabsorbed by it, though others are spared and wander free. No two spawn are the same, and appear to be chimeras composed of practically any body-part nature has ever seen fit to create.