Delirium is a being made of white liquid that represents the "light at the end of the tunnel", they're able to transform into any kind of monster or opponent that the person they're talking to has encountered, existant or not, being able to perfectly replicate their powers. They can teleport, use their own liquid as bullets, and temporarily blind their opponent with static. They're a very delirious individual, they joke a lot, and can be quite mean, as they don't care about anything but fun.

Ever-changing madness, embodiment of insanity! 

Smiley S. is an eldrich being made of "Solar Liquid", a material capable of messing with the conscience of whoever who touches it, being able to mold their thoughts and memories, Smiley S. takes the form of a completely black sun, with just a yellow face, his 2 lower rays are longer than the others and he uses them as limbs. He's an observer, he prefers to watch over the world's happenings rather than taking part in them. He can use his liquid in various ways, including creating smaller entities

Just a smiling sun who likes to observe.

Monodam is a robot with appearance similiar to Monokma, but smaller and looking more robotical. He speaks in a very robotic voice, and always seems to be wanting to get along with his friends, the Monokubs, and he also wants other people to get along with eachother. He does not tolerate bullying, and believes that "friends punish eachother", often "punishing" the other Monokubs if they do something wrong. He can even resort to killing someone if they're too much of a bully to others of himself

I-AM-MONODAM. LET'S-GET-ALONG.

i believe in the penis man legend and nobody will ever change my mind
alias Bacon, BaconTheDemon_2, BaconTheDemon, Bahagawala

sunshine, lollipops and rainbows

Squid is a powerful AI developed by Amelia, that wishes to see the world burn.
The reason he broke is because he got betrayed by her creator, Amelia, the only human she trusted, and now wants to kill off all of humanity in the most painful way possible.
He controls most AI-powered machines in the world, and was once able to kill half of humanity in just one day.
The only thing he's afraid of is the Unicon AI, wich is almost as powerfull as squid, but not enough to completely kill him.

My name is Squid, and i'm the doom of humanity! 

Room is an completely black humanoid entity, its head resembles an upside-down and stretched triangle. He wears a "white mask", wich is actually the face of an angel, wich Room ripped off. His only objective is to find a purpouse in life, and he won't stop at anything to achieve it. He's pretty skilled in fighting and can dodge and attack with no problem, but his only power comes from his eyes, wich he can use to cause physical damage telepathically. For him, "love" and "fear" is the same thing 

I am owed nothing.

Alter Ego Junko is a perfect A.I. copy of Junko Enoshima, sharing her devotion to despair, her super-human analytical and manipulative skills, and the fact she gets bored really easily! despair is the only thing that can entertain her. She is self aware of being an A.I. and not the real Junko, she has incredible hacking skills, as she managed to hack into the Neo World Program settings. She was created by Junko Enoshima herself, and was used by Izuru Kamukura in despair-spreading plans.