I'm so evil... Dark Lord Zenith...
No but seriously, I have had many talks about what /evil/ is in the world.
I have come to this conclusion within my own comic Two Faced
Slight Spoilers
There is Light and Dark obviously, Light being bringing life and keeping it alive, it also is /good/, As in helping someone, or loving someone or something. But there is dark /evil/. Evil being death and destruction, doing bad things, killing things, people. These are both needed to keep the balance of the universe of course. In Two Faced they're are embodiments of the Light and Dark. They themselves don't act good or evil, because it is their job to bring either life or death.
I always seem to get suck on what people/animals see when they are dying, (the tunnel) Death being the light and Life being alive.
I guess the Light could be brought into Death too as in, relief from life. Well there you go.