The Butterfly Family (Patreon)

Though not royal by blood or the sort, Saia's family rule with money and their technological advancements, I imagine them as Chaebols in Korea (specifically, Samsung)

Butterflies are their sygil, as many of their family members were of that mutation. In RHI, Butterflies are a mutation similar to albinoism, only with a twist of them having the ability to see the future and many of its branching results. This power puts their family business literally ahead of the game, and although their country is a Democracy, we all know who truly runs the country, not its head but the one who makes up for 40% of the country's GDP

in other news Samsung makes 22.4 % of Korean GDP, which I think is insane