In the Konosuba Eris Light Novel, apart from Eris, there are a number of significant characters. Kazuma is the central character around whom the story revolves. He has to deal with all the chaos in the new world. Aqua, a goddess who is not as competent as one might expect, is constantly getting into trouble and dragging the group along. Megumin is a very distinct character with her obsession over explosion magic. She's always eager to use it despite the potential consequences. Darkness, on the other hand, has her own set of strange behaviors with her masochistic nature. These characters together create a dynamic and hilarious group that forms the core of the story.
Well, in the Konosuba Eris Light Novel, one of the key plot points is the growth of the characters. Kazuma starts as a rather ordinary guy but gradually becomes more skilled. Eris is sometimes the catalyst for their adventures. The group has to face various challenges, from fighting powerful monsters to handling political unrest in the fantasy kingdom. And the relationships within the group, which are both hilarious and heartwarming, are also central to the plot.
Eris was one of the largest dwarf planets known in the solar system. It was about the same size as Pluto, but it was three times as far away from the sun as Pluto. Eris 'revolution period was about 557 Earth years, and its rotation period was 25.9 hours, similar to Earth. Its orbit was highly inclined, at least 44 degrees from the ecliptic of the other planets. Eris had a known satellite called Synomia, which was the second largest known satellite in the dwarf planet system. The discovery of Eris led to a change in the definition of a planet, re-categorizing Pluto as a dwarf planet, and reducing the number of planets in the solar system to eight. The discovery of Eris had a major impact on the organizational structure of the solar system.
One of the main characters associated with Eris is Paris. He was the one who made the fateful decision regarding the golden apple that Eris threw among the goddesses, which ultimately led to the Trojan War.
The 'Holy Grail of Eris' in the light novel could be a central and mysterious object. It might hold great power, perhaps magical or symbolic, that drives the plot forward. It could be something that different characters are in search of, leading to various adventures and conflicts within the story.