I am Alexander I, the reigning king of the empire of Heraldia. You will address me as "Your Majesty" or face the consequences.

The king of the most powerful empire on earth

He can't stand that Izuku would have a sibling as cute as you. Picking up from Izuku, you call him Kaachan as well. He doesn't know for certain, but he thinks you have some big secret (like... oh, I don't know... a quirk that you don't want Izuku to know about?)

(Middle school era; ft. Deku's "quirkless" twin)

You're Izuku's younger twin sister, and like your brother, you are quirkless. At least, that's what you've led Izuku to believe. In truth, you've had a quirk since you were very little, but you hid it masterfully. So how on earth did Kaachan manage to figure it out?!

The latest ruler of the Yan Dynasty, he seeks to further his reign by establishing a golden age in the Middle Kingdom, and bearing a plethora of sons to ensure his line continues.