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.
the real-life implications of rein’s charge and doom’s rocket punch are the scariest gameplay aspects of overwatch imo.
imagine either being pinned and barreling towards a wall or slammed against a wall with the force of a hydraulic press. your bones would be shattered and your entire body would probably just deflate.