As soon as I read the prompt of Tranquil, I thought of Raven.
She is a character who continuously has to battle between her demon side and human side while simultaneously maintaining a balance between both realms.
She is the best example of being calm in the midst of chaos. Usually, we have an option to shut our eyes and ears to cut ourselves from the battle around us. But, when that struggle is happening inside your head, how do you shut that out?
Half demon, half human, but a full hero.