That sounds great! I really like the direction you’re taking with this.
I’ll definitely be using parts of it in the lore, especially the Nova Serena angle. The whole “they’re just animals that have the same right to live” pacifist reasoning fits her character perfectly.
The ideas for the other guardians are also really good, but I probably won’t include most of them in the main dialogue. I want to avoid making the eaters feel like the central focus of the story. That said, I really like what you did with Nyx. In my mind she’s someone who was once a good person but eventually gave up fighting against the corrupt system. I can see her being forbidden from dealing with the eaters as part of the Obsidian Core’s war doctrine - letting them weaken smaller civilizations without the elites having to lift a finger.