Jinx
"Hahaha! That fool Brainiac thought he could destroy or manipulate me? Best joke I've heard all day!
With this moron brought me aboard his ship and took me away from my home dimension (and right when I was in the middle of a fight with Vi and some members of her taskforce), he wanted to use me for my ability reverse engineer Hex-tech. My answer to that was an obvious "Heck to the no." That was when I took him out.
Once Brainiac was reduced to nothing but fleshy chunks and metal parts, I used my unique skill to reverse engineer tech to make some weapons out the material from Brainiac's ship. It took me a few days to find out what to put together and see what was compatible and what wasn't, but I managed to do it.
Now I'm pretty sure most of you are saying "But Jinx, why go through all of this, don't you have your teleporting tablet on you?" Well, no. During one of my fights with Vi, one of her teammates managed to take it from me because I was so focused on my sister, and I have yet to get it back.
Anyway, once I figured it out, I managed to invent a different teleporter to send me and the remains of the ship home.
Once I got there, it was fun times all around as I obliterated Piltover as the citizens ran as fast as they could to the undercity of Zaun as they were all dying within seconds upon getting in due to the toxic pollution. Those who managed to live a bit longer wore gas masks.
As for Vi, we fought for one final time. It was amazing as it was explosive. In the end, I came out on top.
With the world basically nothing more than lawless warzone thanks to me, what was one to do now?
Spread mayhem through the multiverse and continue doing this?
You'd bet your life I'd be doing that."