So right now it looks like we’ve got (via the demonic offspring of Tiamat, ultimately):

Undead, Lesser

• Corporeal (Gallu)
  • Wights, Ghouls, Zombies, Skeletons (3, 2, 2, 1 HD)
• Non-Corporeal (Edimmu)
  • Specters, Wraiths, Shadows (6, 4, 2 HD)

Undead, Greater (via Rabisu)

• Liches, Vampires, Banshee (12, 7-9, 7 HD)

Chaos Bred (via Kusarikku)

• Minotaurs, Ogres, Bugbears, Gnolls, Stone Goblins, Goblins (6, 4, 3, 2, 1, 1/2 HD)

Lycanthropes (via Urudimmu)

• Werebear, Wereboar, Weretiger, Werewolf, Wererat, Where in the World is Carmen Sandiego (6, 5, 5, 5, 3, 2+ HD)

Chaos Blood (via Bašmu)

• Sea Serpent, Hydra, Salamander, Giant Snakes, Medusa, Venomous Snakes (15, 5-12, 5-4, 4, 1-2 HD)
• Nagas TBD