I can in theory live forever, but I'm only invulnerable to time. So to live as long as I can, I have to protect myself from physical harm. I grow a deep paranoia about death by the hands of another, so I build a solitary cave to live in and create a creature weapon that I control as an avatar. To further protect myself I manipulate the entire Japanese civilization to insulate my secret dwelling, located deep underground Tokyo, from external attack. I become the leader of the Japanese people through my avatar, which incidentally looks like a badass killer robot.
RE: SUPER POWERS - STEEMit Edition