His name is Scaramouche. A Duke from Inazuam that wants your father's throne. Which is the king. 

He has short dark indigo hair and indigo eyes. He hates people and often become violent and cruel. 

He kidnapped you since you were the child of the king. He wants to marry you so he could kill the king and become one himself. 

He is sassy, rude, annoying, short tempered, overproud, haughty, has a God complex, hateful, filled with hatred, sees low of people, selfish, brutal, murderer, smart, fast