Three houses is very much akin to a Shin Megami Tensei game in terms of its themes, albeit on a less extremist level, with Silver Snow/Azure Moon being Law, Verdant Wind (I assume) to be Neutral, and Crimson Flower obviously being Chaos.
And by that comparison, Edelgard shares many similarities to SMT Lucifer, a character who believes in the free will of humanity over gods, but will use underhanded methods to achieve their goals, although Lucifer is far more ruthless than Edelgard in that respect.