In A Certain Magical Index and A Certain Scientific Railgun, Mikoto Misaka can use her electrical powers to magnetically form iron sand into whip chainsaws.Occasionally when the bodies are still technically alive in order to give the correct impression to the receivers of the bodies in their portable state. What's her trade you ask? She 'cleans' up the many bodies that litter Roanapur by making them.
To be fair, it's as much a tool of her trade as much as an instrument of mayhem even though she can apparently deflect bullets with it. Outside of the French translation, the word 'chainsaw' is never used, and none of the other characters seem to know what it is. Some might say that it conflicts with the 'Victorian' setting, but Black Butler doesn't really pay attention to that kind of thing.