|Primary Residents||The Alternate inhabiants of the Matoran Universe|
|Location||In the dreams, inside a portal on Artakha|
|Size||Same size as the Matoran Universe|
Do you see the difference between the real and the alternate characters? Take a look!
- Ceasame - The Great Spirit of the Nightmare Universe
- Atukam (Unofficial)
- Krataka (Unofficial/Formerly)
- Matoh (Unofficial)
- Yonex - A ghost of the Fallen Warriors
- Krall - A ghost of the Fallen Warriors
- Akatark - The last member of the Fallen Warriors
- Fratan - A mysterious bounty hunter
- "The Shadowed One" - Former leader of the Dark Hunters
- Hades - Former leader of the Skakdi (Deceased)
- Zardak - New leader of the Skakdi
- Tazzuk - One of the leaders of the Dark Hunters
- Makuta of Ko-Metru - One of the leaders of the Dark Hunters
- Skakdi - Monsters from Zakaz ruled by Hades/Zardak
- Maxilos Robots - Everyone were destroyed by Lhikan when he saved Krataka.
- Dark Hunters - Ruled by Tazzuk and the Makuta of Ko-Metru
- Fallen Warriors - A disbanded Toa Team after everyone except Akarark died.
- Mata Nui - Former Great Spirit of the Nightmare Universe and prisoner in the Archives
- Lhikan - Leader of Metru Nui
- Teridax - Killed by Ceasame to stop him from overthrowning Mata Nui.
- Miserix - Former leader of the Brotherhood of Makuta
- Brotherhood of Makuta - Ruled by Tuma, will soon be eliminated
- It's official how it got it's name. It was named "nightmare" because many in the Matoran Universe comes to this universe when they get nightmares.
- The Unknown Toa of ???, Krataka and Matoh aren't really inhabiants of the Nightmare Universe since they aren't alternate.
- The Hydros Chronicles
- Magical Journey
- Legends of the Order of Mata Nui
- Ceasame's Blog: Adventure of the Fallen