The Dark Matters

The Dark Matters are a large organization of dark forces led by Nightmare's remaining souls after his demise that mainly manipulate poor souls into causing mayhem and sometimes even becoming lifeless monsters just to gain their main desires.

Pre-series
While not particularly stated if the Dark Matter organization is a successor or even formerly Nightmare Enterprises, but ever since it has gone bankrupt and shut down, Nightmare's soul has been split by a mysterious figure into three beings taking the form of two puffballs and one Waddle Doo. Unable to refuse without help, this trio would seek members to join their organization so they would eventually become their true form.

Language
Interestingly, Dark Matters have seemed to develop their own sort of language, in which Shiru calls "Shadow Chanting." It is extremely difficult to learn and master, for only natural Dark Matters themselves are able to alter the filter of their voices, such changing their pitch and accent.

However, early in the main series (off-screen), Shiru was able to invent a simpler and easier-to-learn version known as "Simple S. Chant" or S. Chant for short, simply from Hyness's language. Here are a few examples:

Main

 * Nightmare (technical founder)


 * Zero (leader)
 * Dark Matter (co-leader)
 * Dark Rimuru / Rimura / Rumuro (chaotic trio)
 * Winston 1.0 (brains/group advertiser/formerly NME Sales Guy)
 * Miracle Matter (mimic)
 * N-Z (low-class)
 * Zero-2 (spare manager)

Henchmen
This section would include members that joined specifically to have their desires granted, corruption, or other certain reasons.
 * King Dedede (causing trouble)
 * Squeak Squad (treasures/ultimate power)
 * Kabi (redemption)
 * Marx (domination over Popstar)
 * Magolor (universe domination; controlled by Master Crown)
 * Queen Sectonia (endless beauty and power)
 * Max P. Haltmann (the company's success)

Formerly

 * Gooey (decided to split up)
 * Pon & Con (were corrupted; both fell to Popstar)