Okay, you're all going to bash me for this and I'm sorry. But it's general discussion and this is a place I come when I seriously want to think. So the things I say tend to make people question me or offend people ._.
Well, first off "good" and "evil" derives from your morals, so I'm going to ignore that (you're all going to say I'm evil xD)
I'd have immortality. Meaning I have the ability to reject pain & death itself. Also, I'd have a weakness which I'll describe below. Why? To implement a plan of mass genocide upon humans. I despise humans, they're completely ruining this earth we live on, and if we continue living we're going to destroy other planets that may have potential as well. That's completely uncalled for, and humans need to be stopped, whether by natural course (which obviously won't happen because we prepare for things such as blizzards & storms) or by force (mass genocide or any other spinoff such as alien invasion). So when granted immortality, I could kill anyone/everyone without feeling pain. So I'd go kill everyone in the world. (Much easier said than done, I know) after I somehow accomplish that, I'd use my weakness to kill myself. My weakness would perhaps be so random and rare that no one would ever think of using it, (Perhaps a certain type of flower?). That would be my superpower.
Now, realistically speaking. None of this would happen, I couldn't go through the emotional pain of killing another helpless human being. It'd just be too much for me to handle. So don't think I'm "ignorant" due to the things I said above.
Although this is merely a dream of "what if" so realism doesn't take place in this world. :3
It's 1am here so I probably shouldn't be posting my opinions on a forum when I'm half asleep O_X. Sorry if I don't make sense/offended you. Perhaps we don't see eye to eye.