Here is a fanfic of mine (currently in progress though). It is very hardcore and violent as it involves Aelita being possessed by Franz Hopper in order to battle Xana William. Here it is.
http://www.fanfiction.net/s/3447313/1/
Now if you want to read something really interesting, then read the final chapter in this fanfic so far (titled "No Mercy) because Franzified Aelita has Xana William begging for mercy and battles him with her white lightning orbs (a power she gained through being possessed by Franz Hopper). And as for the other chapters, I think you'll find them very interesting and well plotted out.