Gekko Nokomura
About
Inspired by the manifesto, Nero kidnaps and enslaves all of her mutual classmates, reanimates their corpses and modify them beyond recognition, twisting their bodies and minds into her grotesque, monstrous underlings. She then sics her army on the only survivor Geeko who had other ideas in store. Armed with her trusty chainsaw, there's no stopping Geeko's murderous, rage-fueled onslaught to end Nero's mad science no matter how many undead former friends she has to slay on the way.
(Source: TVTropes)