Hades,Poseidon,and Artemis Picture

Saint Seiya Cosplay as Hades (left), Poseidon (center) and Artemis (right)

Editing to me
Credit to Prayudi Kitsune

Hades - Shun
Hades (ハーデス, Hādesu?) is a mythological deity and serves as the primary antagonist in the last story arc of the Saint Seiya manga written and illustrated by Masami Kurumada, later adapted to anime.
In the story, Hades is the ruler of the Underworld (冥界, Meikai?) and old enemy of Athena. He wishes to wipe out humanity, turning the Earth into a desolate wasteland. He despises the human beings, who are each time more ungrateful towards the gods.

Poseidon - Julian Solo
In Kurumada's mythos, Poseidon, the god of the seas, in order to incarnate, has chosen a male member of the Solo family, since the age of myth. The Solo family, one of the wealthiest in Greece and in the world, has had hegemony over the seas during millennia, and has had Poseidon's blessings as his chosen servants. The member of the Solo family Poseidon chooses serves as a vessel for his soul, to help him achieve his goals.

In Poseidon's latest incarnation, in the 20th century, he incarnated in the young heir of the family, a teenager named Julian Solo. His goal was to cleanse the Earth of humans, whom he considered to be evil and unworthy of the blessings of the gods, and wanted to build an utopian society on top of the ruins of the old Earth once all humans were eradicated. Also, he wanted to exact revenge on Athena for having sealed his soul 2000 years before, in their last battle.

The Greek goddess of the moon Artemis (月の女神アルテミス, Tsuki no megami Arutemisu?) is one of the antagonist deities featured in the universe of the Manga Saint Seiya, authored by Masami Kurumada, that was later adapted to Anime. She was created by Kurumada based on the mythologic persona of the same name.
As in Greek mythology, she is the goddess of the moon, the hunt and virginity, and younger sister of Apollo, god of the sun. In Kurumada's mythos, she is also the older sister of the protector goddess of Earth Athena.
She first appeared in the only one out of the five Saint Seiya teathrical releases that holds a canonical status: Saint Seiya Tenkai-Hen Josō Overture, as it follows the author Masami Kurumada's true chronology and manga plot. In the same way as her brother Apollo, not much has been revealed about Artemis, although she was recently introduced by Kurumada in his manga Saint Seiya, in chapter 15 of his current work Saint Seiya Next Dimension, the canonical continuation of his original manga.[1]

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Ares - Mars
ZEUS art deco
Hades,Poseidon,and Artemis
Persephone- Cover