This Index Is Unstoppable

There are many types of characters throughout fiction who are difficult to stop or even slow down.

Tropes

 * Advancing Boss of Doom
 * Advancing Wall of Doom
 * Determinator
 * Foe-Tossing Charge
 * Implacable Man
 * The Juggernaut
 * Mighty Glacier
 * Mysterious Mercenary Pursuer
 * Non-Giving-Up-School Guy
 * Perfect Play AI
 * Perpetual Motion Monster
 * Stone Wall
 * Super-Persistent Missile
 * Super-Persistent Predator
 * Unstoppable Force Meets Immovable Object
 * Unstoppable Mailman
 * Unstoppable Rage
 * Why Won't You Die?