Midi-chlorian (of StarWars fandom) resides in blood, and refers to microscopic lifeforms that generate the Force. Anakin Skywalker for example has the highest measured midi-chlorian concentration of all Jedi. If we consider these midi-chlorian to be volatile bits of toxic pure digital energy that travel at the speed of light and settle instantly through time and space, which of the [well-known] characters that you've come across are the most toxic? For me it's Svetski, Krater a close second, and @Darthcoin nipping at their heels.