I don't know who that is too!
But if you truly think Light Yagami isn't "evil" (taking his intent into consideration & how he reacted in the ending) then I think you need to revisit Death Note
No he isn't, he is neutral at best. And what he said in the end is more of a narcissist behavior than truly believing in evil philosophy.
I'll give you some examples of real evil characters: Every one knows Joker, who kills for his own entertainment. Light doesn't do that.
Jabba the Hutt or Emperor Palpatine? Those people people want power and they use power for personal gain not greater good nor "Justice" ideology. That's evil.
Evil people doesn't do things because they have "Justice" in mind. They do things because they love power and money or personal pleasure so their actions will aim for that goal, and they'll prioritize themselves over everyone else.
I don't see Light as evil at all. He may be manipulative, he may hurt other people. He may abuse his powers too much in the end. But his actions intent are deeply rooted in a belief that what he is doing is "Justice". Real evil characters doesn't give a damn about Justice. They'll just say "I'm doing this because I want more money/power/fun."
Anyone who valued Justice or greater good doesn't belong to evil alignment.