Rishar would be the type

He may be a admirable and noble hero at this point but he'd be the type to go down and be a tyrant if he ever HYPOTHETICALLY lose the love of his life (Etienne). He pretty much dedicated all his achievements just to be with our poor prince. So if he becomes Emperor and that would cost Etty's life, then boy oh boy will this empire regret wanting Rishar to rule in the first place.
Hahahaha these are my angsy what ifs only won't be relavant to the plot