This is another character of whom I am unsure whether he is a villain! Jason started as an unambiguous hero and even after his turn his main motivation seems to be preventing harm from being done to innocents, but even as a child he displayed a disturbing nonchalance towards killing of criminals, which he took to an extreme after returning as Red Hood. His multiple murder attempts of underage heroes are particularly inexcusable. In modern comics, he no longer kills, but his appearances within last decade were awfully written so they may as well not exist.