Naughty Bear

Naughty Bear is the titular protagonist of the Naughty Bear series, however to call him a hero one would have to delve deep into the sliding scales of anti-hero - the very edge of it.. which is what is known as a "Heroic Sociopath" or "Hero In Name Only".

Due to the general Crapsack World Naughty Bear lives in he avoid the complete monster status in the sense his many victims are, in general, not very pleasant individuals themselves but the game rewards being "naughty" - which in its (deliberately) twisted morality "naughty" can be anything from simple scaring to outright murder.