| Name | CR | Type | Environment |
| Kaion | 2 | animal | mountains, urban, or vacuum (Diaspora) |
| Kalo, Kalo Deepspeaker | 5 | monstrous humanoid (aquatic) | any aquatic (Kalo-Mahoi) |
| Kalo, Kalo Sharkhunter | 2 | monstrous humanoid (aquatic) | any aquatic (Kalo-Mahoi) |
| Kami, Chinjugami | 16 | outsider (kami, native) | any |
| Kami, Tsukumogami | 4 | outsider (kami, native) | any |
| Kaukariki | 1 | magical beast | warm forests (Castrovel) |
| Kayal | 7 | outsider (native) | any (Shadow Plane) |
| Khefak | 1/3 | vermin | any (Akiton) |
| Khefak, Thasteron Khefak | 3 | vermin | any (Akiton) |
| Kish | 4 | humanoid (kish) | any (Nejeor VI) |
| Kothama | 10 | magical beast (cold) | any (Vesk-7 or Vesk-8) |
| Kothama, Kothama Ascendant | 14 | magical beast (cold) | any (Vesk-7 or Vesk-8) |
| Ksarik | 4 | plant | temperate or warm forests (Castrovel) |
| Kurobozu | 9 | undead | any |
| Kyokor | 20 | magical beast (colossus) | any (Daimalko) |