Pharos Hercules

The main antagonist, a dream demon who leads a group of others to the real world so they can possess humans. His plan is to turn the real world into a place where dream demons can manifest without needing humans as vessels.

Appearance
Heracles looks like an armor, his skin is black with deck circle-shaped marks all over his body.

Personality
He is completely amoral, as he told Clione that he doesn't care about what happened to Ransborough or Chain Noir despite them being completely loyal subjects of his.

History
John stated that he and Merry arrived in the real world at around the same time, almost a decade ago, but that his power hadn't started manifesting until very recently.

At some point, he possessed Takateru Akiyanagi. He also forced Clione to possess Taka's younger sister so Clione could track down dream demons in the real world, furthering his cause.

Some of his minions included Ransborough and Chain Noir, though Merry successfully sent both back to the dream world.

Powers & Abilities
He wields a scythe-like axe in battle, as when he fought Engi. He also seems to be able to "reflect" whatever ability is used against him, as he was able to skewer Engi with her own swords after she attacked him with her "Violet Flash Sannasubi" (15 sword attack). In the same battle, he manages to destroy Enji's aGarden and replace it with his own, an ability Chain Noir later describes (when Yumeji does something similar with her and John Doe's Garden) as connecting two Gardens together.

Like Merry, he is also shown in this fight the power to destroy Gardens (though he didn't show a keychain).

Unlike Merry, however, he stills needs to manifest in the real world through the use of a vessel (Takateru Akiyanagi).

He also wields Patty's sword (once Engi's older sister's sword) but he hasn't used it. It's curious as to why it still exists despite her death, unless Heacles can keep certain aspects of a dream demon "alive."

Relationships
Takateru Akiyanagi: his human vessel. He has possessed Taka since the entire group was in elementary school, asking Yumeji not to look at his dream aura to avoid Yumeji discovering the truth of Taka's possession.

Sonar Clione: he forced her to possess Miyuki, Taka's sister, to locate dream demons in the real world.

Ransborough: along with Chain Noir, he commands them into recruiting more dream demons to possess humans in the real world.

Trivia

 * It was revealed that Takateru Akiyanagi is his vessel.