It is interesting to see how Kurumada always thought of Eris as an antagonist in Saint Seiya (she was probably even the first god to be an antagonist in this franchise, even before Poseidon and Hades), and it is even more surprising that he never used this character in a story written and illustrated by him.
The first movie of this series has Eris as the antagonist and is the film where Kurumada was more involved in its production, even this film is the one that introduces several ideas and concepts about the gods that would be retaken in Poseidon's Arc.
Then the Musical (Saint Seiya Super Musical) was released, which adapts the story of the first movie, but with a revised script by Kurumada himself (who has always been a fan of these productions) to adapt it to the story of Saint Seiya. For example, the protagonists use the Cloths of the Poseidon Arc, Eris has her own army of evil spirits (a concept that was expanded in Saintia Sho with the dryads) and the character of Orion is rewritten.
It is also interesting to see that the design of the Silver Cloths of the Ghost Saints changes a little and now Orion has a mask and not a helmet, similar to the Orion Cloth in the Saintia Sho, probably the original design of Kurumada for the Orion Cloth had a mask, and it was Araki who placed the helmet similar to what he did with the first versions of the armor of the Bronze Saints in the anime.
Finally the definitive version of Eris in the Saint Seiya universe is introduced in Saintia Sho. As Kuori explained in an interview the choice of Eris as the antagonist of this manga was Kurumada's idea, and also the author explains that "Evil Goddess Eris " (邪神エリス) was the movie where Kurumada was more involved in its production.
Japan Expo 2016:
Après la conférence de Shiori Teshirogi, c'est une autre artiste œuvrant dans l'univers de « Saint Seiya » qui a échangé avec ses lecteurs ce dimanche : Chimaki Kuori, pour « Saint Seiya : Saintia Shô », une série orientée héroïnes ! Saint (...)
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À la question de savoir s’ils suivent le manga ou l’animé pour créer
Saintia Shô, elle répond que, bien qu’elle apprécie l’animé, il lui faut avouer que ce dernier a déjà comblé et rempli pas mal de trous ! Par rapport au film mettant en scène Eris, la déesse de la discorde, et au fait que
Saintia Shô reprenne cet antagoniste, Chimaki Kuori a indiqué faire comme si ce film n’avait jamais eu lieu.
Le choix de mettre en scène Eris vient de Kurumada, une fois de plus, à la fois dans l’idée de féminiser le plus possible le casting, parce qu’il s’agissait du film dans lequel il s’était le plus impliqué à l’époque, et parce qu’il y reste donc très attaché.