roguishness       
noun [ U ] uk/ˈrəʊ.ɡɪʃ.nəs/ us/ˈroʊ.ɡɪʃ.nəs/
 调皮捣蛋;顽皮
a quality that suggests someone is acting in a way that is slightly bad or wrong, but not seriously so
  She has a charming roguishness. 她有一种迷人的调皮气质。 
 His roguishness makes him a likely choice to play Vlad the seducer. 他的流氓气质使他有可能成为扮演诱惑者弗拉德的人选。 
 See: roguish
 - More examples
 - I like the loveable roguishness of Stuart.
 - The audience cares about the characters, despite their roguishness.
 - There's a kind of roguishness to her that's irresistible.