A superhero that tends to appear when not formally summoned to the scene. His superpower? I don't think you can figure it out...*sarcasm*

He can be dismissed with a sarcastic counter-attack, such as acknowledging his presence.

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.