Non-playable character

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Non-Playable Character, or NPC refers to a character in a video game whose actions cannot be controlled by the player. However these characters are often an important part of the storyline.

NPCs are only seen in gameplay with the player, and are usually either allied or neutral to the player. Classically, they feature unique triggers and dialogue that differentiate them from "normal" allies because they are vital to the development of the game's storyline.

In Halo: Combat Evolved, there are only three NPCs, Captain Jacob Keyes, Avery Junior Johnson and 343 Guilty Spark. Keyes is only seen a few times, but if he is killed, the mission is failed and you must restart the level. 343 Guilty Spark is invincible and immune to any attacks on him during the game. And Johnson can be killed with no reprecussions.

In Halo 2, all NPCs are invincible. They usually fight alongside the player and lead allies into battle. Most of the time they are also armed with stronger weapons and feature unique dialogue that is integral to the storyline.

In Halo 3, they share the same characteristics of the Halo 2's NPCs, but when they take too much damage, they will fall to the ground, lifeless, and stay there until the battle is over. Soon after, they will stand back up and utilize any nearest weapon, more likely their own.

List of Halo NPCs

Halo: Combat Evolved

Halo 2

Halo 3