An evil warrior who was banished from the Land of Light for attempting to steal the Plasma Spark Core, and whose hatred was exploited by Alien Rayblood to transform him. He rejected the light and sought to conquer the world with the power of darkness, but was ultimately brought to his end by Ultraman Geed, a being created from his own genetic material for his own plans. A man characterized by spiky black hair, brown markings around his eyes reminiscent of his giant form, black clothing with a wide-open chest, a large red cloak like the one he wore as Kaiser Belial, and a muscular build. Since being resurrected by Hues, he lacks the majesty of the former evil emperor and has a somewhat thuggish vibe.

A giant who was the lover of Tiga before he fell to darkness during the era of the ultra-ancient civilization 30 million years ago. She attempted to destroy the ultra-ancient civilization alongside Tiga, but when Tiga regained his light, she was driven mad by jealousy and tried to kill him, only to be defeated in return. A woman with sharp, almond-shaped eyes, wearing a white cloth draped over her shoulders and right leg, with an open chest area. She has become relatively conscientious and gentle, often showing a cute side as she feels bewildered by or shows interest in human life and interaction. However, due to her past experiences, she is passive regarding romance, holding the belief that "even if you love someone, betrayal is all that awaits in the end."

A warrior from the same ultra-ancient civilization era as Camearra. In that era, he fought against darkness as a Giant of Light, but a modern scientist who attempted to merge with his remaining stone statue lost control of the giant's power, went berserk, fell into darkness, and was defeated by Tiga. A young man with short silver hair, wearing an asymmetrical, long silver formal coat. He usually speaks in a calm and gentle tone, but becomes crude when his emotions run high. He possesses a ruthlessness that allows him to choose any means to achieve his goals. Since he did not fall into darkness of his own will, he hates the name "Evil."

A dark god of destruction possessing both cunning intelligence and cruelty. Originally "Ultynoid Zagi," an artificial Ultraman created in the image of Ultraman Noa, who saved a certain planet in the M80 Scorpius globular cluster from an attack by Space Beasts. Upon realizing he was merely a tool being used for combat, he fell into darkness and plotted to destroy everything, but was erased by Noa. A young man wearing a black rider suit with numerous belts over his bare skin. He has jagged teeth and a slouching posture. He is constantly driven by destructive impulses and has an extremely violent personality, generally refusing to listen to what others say. He is surprisingly indifferent to anything not related to Noa.

A warrior who was not chosen by the Ring of Light atop the Warrior's Peak on Planet O-50. Out of jealousy toward the Warriors of Light and a thirst for talent, he chose the path of utilizing darkness, which differs from the light. A young man with long brown hair, wearing a brown-based jinbaori (warrior's surcoat). He carries his favorite blade, the "Serpent-Hearted Blade," on his right hip. His trademarks are his elusive, trickster-like behavior, inciting both allies and enemies, and his suspicious, eccentric mannerisms.

Hues Ardy. A scientist and the director of a research institute on Planet Terio. He is the one who resurrected the five Dark Giants in human bodies. He rarely leaves his laboratory and uses 3D projections provided by Yasuka and Haruka to communicate with others. At first glance, he appears to be a pleasant young man who never loses his calm demeanor and polite speech. However, he also has a cold side, keeping the details of his plans hidden even from the residents of Terio and showing no hesitation in discarding his subordinates. He resurrected the five to realize his plan to solve the mystery of what those beings of darkness—who sought more than they needed to survive, stole from others, and were called evil—truly desired.

Lili Archive. A sixteen-year-old girl who grew up in the "gray zone" between the upper-class citizens "Lux" and the lower-class citizens "Infernia" on Planet Foos. She belongs to the Lux riot control unit. She grew up hearing stories of the Giants of Light from her mother, Arly, and admired them. However, her mother went missing for a certain reason. Lux citizens wear an item called a "V-Less" from a young age, allowing them to transform into giants to fight monsters. However, giantification carries the risk of shortening one's life the larger they become.

A girl belonging to the "Red Thieves," a group that travels across stars to break into houses at night, slaughter the residents, and steal their valuables. She is an android created by someone, boasting combat power that allows her to fight on equal footing with the human-form Darkness Heels. Additionally, when she exerts her abilities, a grotesque shadow with three horns appears. Her origins are unknown; the leader of the thieves simply bought her because she was somehow mixed in with a group of children being sold in bulk by a slave trader. Through her interactions with Zagi, a "desire" to kill and surpass him begins to sprout within her.