The Red Deep Nightmares closely resemble the Deep Nightmare. They resemble humanoid chameleons with thick forearms and have purple smoke emitting from their back, much like the Nightmare. Unlike the Nightmare, however, they are slightly taller and their horns and tails are larger and more jagged. They also have several more teeth with tusks in the corner of their mouth, and they have a greater number of spikes on their back (which are larger than those of the regular Nightmare). Unlike the normal Deep Nightmare, however, their skin is pinkish-red and their markings glow in a cyan color.
The Red Deep Nightmares and the rest of Dark Gaia's Minions came into being when Dark Gaia broke apart at the beginning of Sonic Unleashed due to its premature awakening by Dr. Eggman. These fragments were then spread across the Earth and became Dark Gaia's Minions, with the Red Deep Nightmares amongst them. They first appear in Eggmanland Night Act I: Level 1 - Infiltration.
As more powerful versions of the Deep Nightmares, the Red Deep Nightmares are faster, can deal more damage to the player and have more health than any of their Nightmare relatives. They usually appear in large groups of themselves.
Like their relatives in battle, the Red Deep Nightmare fights with hand-to-hand combat. Being the most dangerous of the Nightmare variant, the Red Deep Nightmares fight more aggressively than any of the other types of Nightmares. They usually strike with their stretchy arms and can make body flips that cause damage to Sonic if they land on him. They are also capable of aerial attacks; if Sonic jumps into the air, the Red Deep Nightmares can jump up and knock him down again. When fighting defensively, they can nullify the damage from the player's attacks by guarding, which can be broken with the right combo attack or be automatically lowered after a while.
Upon the reconstruction of Dark Gaia by Dr. Eggman, all of the Red Deep Nightmares (along with the other types of Dark Gaia's minions) were returned to the beast, who was later defeated and sealed within the planet's core.
Powers and abilities
The Red Deep Nightmares are able to move around by emerging from black puddles on the ground. As a Dark Gaia minion, the Red Deep Nightmares can possess people by latching onto the deepest, darkest part of the heart, and generate despair, negative emotions or even erratic behavior that are completely opposite to the person's personality.
Being the highest evolved form of the Nightmare, the Red Deep Nightmares stand as the strongest variant of the Nightmare variant and as such possess strength, speed and durability well above even the Deep Nightmares. They also possess elastic bodies, allowing them to stretch their limbs over a slightly larger area.
The Red Deep Nightmares have a profound degree of skill and cunning in terms of hand-to-hand combat, being able to fight opponents with strong and fast combos and can guard against attacks using their arms with great skill.