Byronic hero

Short definition from Wiktionary

Noun

1. 1
   A character type originating in the works of Lord Byron, typically characterized by introspection, arrogance, cynicism, emotional depth, and moral ambiguity; often alienated from society and at odds with conventional morality.
2. 2
   An archetype of a moody, brooding, rebellious, and self-destructive antihero found across later fiction and media, marked by intelligence, passion, and alienation from social norms.