Heroes who express a disturbingly calm, cool-headed and even cheerful demeanour in situations where most sane individuals would panic and stress. Heroes with Dissonant Serenity almost always remain calm and composed, even in the midst of the chaos that ensues wherever they happen to be, essentially making them the opposite of Paranoid Heroes. There can be several reasons for their serenity:
- The hero has some kind of mental illness or psychosis, as many commonly assume, and therefore treat situations as much less serious than they really are. Examples include Yuno Gasai and Shiki Ryougi.
- The hero is an eternal optimist, often due to being very innocent and having a naive view of the world. A perfect example is Irisviel von Einzbern.
- The hero is simply emotionally removed from the situation, as they are used to dealing with such situations to the point that it's like a second nature to them. Examples include Del Spooner, Samara and Rukia Kuchiki.
- A rare example is that the hero isn't calm by choice. Rather, they have to stay calm to avoid unleashing their great power and harming those around them. The Hulk and Eucliwood Hellscythe are the best examples of this type.