A Badass scientist who fights vampires with his cute dog. He found a cure to a virus that killed almost every human. He also commited suicide in a very badass way with a grenade while being cornered by vampires.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.