Neither a data-driven story nor a technical one.
A 70/30 split between transmigration and online gaming.
I'm not opposed to adding a whole range of unit types. After all, Heroes of Might and Magic III has fewer than a hundred units, even at most. This is a world where players always take the initiative, and strategy and individuality are what matter most.
From a certain point of view, the protagonist is an annoying guy right from the start, and he's already almost beyond the point where humanity can stop him! Yet he looks forward to the arrival of the mightiest being.
It's somewhat like Heroes of Might and Magic: Kingdom Wars.