ジャスティン＝ロベラッティ

The first prince of the kingom.
Edvard's half brother.
Because he was born to a lower class mistress, his right to the throne is lower than his brother's.
Holds emnity towards Edvard despite their blood relation and keeps sending assassins after him but the heroine has stopped them every time.
Since she keeps getting in his way Justin wants to deal with her somehow.