As in what part (or parts) of a character that are terrifying in action or given thought. It can be looks, personality, ideology, and/or an ability if applied with real-life implications.
For instance, Doomfist is scary because of his ideology; the concept of using conflict to further humanity implies a never-ending wave of war where if you aren’t strong, you will suffer or die.
Genji👿🐉🗡️🖤💚🌑 and Hanzo👿🐉🏹🖤💙🌑. Imagine being a criminal, and you are in a mob giant reunion and it’s night and you see two shadowy figures on s building. You blink and they are nowhere to see , then you see them better because they are approaching. Genji throws a car against your friends, then Hanzo shoots arrows against your friends. Then you see them unleashing The Demon Dragons against you. The police arrives and all they see is destruction.