Ultimate Sleepwalker: The New Dreams, fitting for a series whose protagonist is an alien from another dimension who fights supernatural horrors and demons, does not skimp on scary:
- The nightmarish dream world that Sleepwalker's Arch-Enemy Cobweb creates by possessing the mind of scared young Reality Warper Kevin Mac Taggart. The dream world is a shifting twilight world of ugly colors, half-seen images and distorted surroundings that threatens to grow and expand like a cancerous tumor until it consumes the whole Earth, engulfing the minds of everyone on the planet in its wake;
- Cobweb himself, a demon from the Mindscape who thrives on the Cycle Of Hate caused by racism, violence and war, and actively tries to fan the flames of hatred that arise from such conflicts. He also brutally kidnaps and tortures Sleepwalker's Big Brother Mentor, turning him into a hideous monstrosity called a Dreamkiller, that becomes tied up in the brutal Mind Rape of one of Rick Sheridan's human friends, who's eventually Driven to Suicide;
- John Edward Cicala, alias Jack the Ripper, the illegitimate son of a British nobleman and a nameless street prostitute who made a Deal with the Devil to turn himself into a demonic force capable of possessing evil men and using them as his People Puppets to go on a killing spree murdering street prostitutes;
- The Scarecrow, formerly a Serial Killer who murdered almost two dozen people while dressed as a scarecrow but is now a malign demon who specializes in murdering innocent people by Mind Raping them in their dreams, a la Freddy Krueger;
- Sleepwalker's Evil Counterpart Psyko, a human gang leader twisted by Cobweb's demonic power into a humanoid abomination that combines Hannibal Lecter's disturbing intimacy with his victims with the ability to make his victims suffer their worst nightmares and a healthy dose of rape imagery that perverts true love and intimacy;
- Mr. FX, a Woobie, Destroyer of Worlds whose psychic temper tantrums reveal a disturbing Psychopathic Manchild personality and who triggers deliberate accidents and hallucinations in his victims to make them serve as his "toys";
- Fever Pitch, a living, flaming skeleton and Manson-like cult leader who's obsessed with the idea of a nihilistic vision of burning society to the ground and watching sadism and chaos run amuck;
- The Dreadknight, an undead Blood Knight who's been forcibly resurrected and sent to kill Sleepwalker, and is unable to die and rest in peace until he accomplishes his task;
- The Bookworm, a depraved magician who was horrifically tortured by the bullies at his high school and who's now obsessed with getting revenge on them, and on Sleepwalker for his opposing them;
- Sleepwalker's own psychotic breaks after he suffers a vicious Curb-Stomp Battle and Mind Rape at the hands of Psyko, which drives him insane and nearly leads him to murder his Heroic Host Rick Sheridan.
