Well, Riviera focuses on the main characters, mostly.
Yggdra Union focuses on the enemies mostly. There a ton of enemy characters - about three times as many as player characters. Some are more developed than others. Just count the number of appearances and you get an idea of who is more important in the story.
Knights focuses on the enemy almost exclusively. Most of the cutscenes have neither Maria nor the King in them (the main characters). The Knights (from the title) have a lot of scenes, but for some reason their stories are not very memorable.
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