Want to Get Radical?

Meet RARA: The Radical Action Robotic Assistant

You want to change the world, or at least subvert the dominant paradigm, but you don't know where to start. It's all so overwhelming. We understand. Simply press the button for your daily radical activity.

Which character, if killed, would really mess up this whole situation? I know, they are too important to kill off. But due to pressing family problems, they could leave indefinitely.