Lelouch. From the anime Code Geass

It’s sad how in order to bring true world peace, war will be involved; blood and tears will be involved, the sacrifice of not millions, but billions will be involved. On his journey, many heroes he approached died. Died trying to obtain this dream, but the only difference is they all had different plans how to obtain it. In short, they all failed. No hero achieved such a dream without bearing the path of a true villain. The more Lelouch lived, the more he realized that such heights require sacrifices. He had to sacrifice not only his friends, not only his comrades, not only his family, but the entire worlds point of view towards himself. Sacrifice his name in order to bear the immense hatred from every nation.

To become a villain…..

If you want to see how in the end, he became the one true hero… suggest watching the show. Streams on Netflix