You know a guy is going to be evil in a piece of historical, fantasy, or historical fantasy media when his niece or nephew exclusively refers to him as Uncle and he and his brother almost always call each other ‘Brother.’ Take this short scene for example.
GOOD GUY: (Bursts into the throne room with much fanfare) Ah, it’s been too long since I walked these halls!
KING: (Sitting on the throne) Eodmar! How unexpected! You’re back from your voyage already! My daughter will be so excited to hear your tales of the lands across the sea!
PRINCESS:(Entering from a side door excitedly) I thought I heard your footsteps, Uncle Eodmar.
GOOD GUY: (Smiling broadly) It’s so good to be back where I belong.
CONTRAST THIS WITH THE OBVIOUS BAD GUY VERSION!
BAD GUY: (Skulks sinisterly into the throne room, gently strokes the throne) Ah, it’s been too long since I’ve walked these halls!
KING: (Walks in the door behind him, startling him) Brother! How unexpected! You’re back from your voyage already! My daughter will be so excited to hear your tales of the lands across the sea.
PRINCESS: (Entering from a side door, with an air of disdain) I thought I heard your footsteps, Uncle.
BAD GUY: (Smirking evilly, his eyes drifting toward the throne again) It’s so good to be back where I belong… Brother.