Non-player character in the context of "Couch co-op"

A player character (also known as a playable character or PC) is a fictional character in a video game or tabletop role-playing game whose actions are controlled by a player rather than the rules of the game. The characters that are not controlled by a player are called non-player characters (NPCs). The actions of non-player characters are typically handled by the game itself in video games, or according to rules followed by a gamemaster refereeing tabletop role-playing games. The player character functions as a fictional, alternate body for the player controlling the character.

Video games typically have one player character for each person playing the game. Some games, such as multiplayer online battle arena, hero shooter, and fighting games, offer a group of player characters for the player to choose from, allowing the player to control one of them at a time. Where more than one player character is available, the characters may have distinctive abilities and differing styles of play.

A gamemaster (GM; also known as game master, game manager, game moderator, referee, storyteller, or master of ceremonies) is a person who acts as a facilitator, organizer, officiant regarding rules, arbitrator, and moderator for a multiplayer role-playing game. The act performed by a gamemaster is sometimes referred to as "gamemastering" or simply "GM-ing."

The role of a GM in a traditional tabletop role-playing game (TTRPG) is to weave together the other participants' player-characters' (PCs) stories, control the non-player characters (NPCs), describe or create environments in which the PCs can interact, and solve any player disputes. This basic role is the same in almost all traditional TTRPGs, with minor differences specific to differing rule sets. However, in some indie role-playing games, the GM role significantly differs from the traditional pattern. For example, in Powered by the Apocalypse systems, the other players assist the GM in creating both the NPCs and the details of the campaign setting.

Dungeons & Dragons (commonly abbreviated as D&D or DnD) is a fantasy tabletop role-playing game (TTRPG) originally created and designed by Gary Gygax and Dave Arneson. The game was first published in 1974 by Tactical Studies Rules (TSR). It has been published by Wizards of the Coast, later a subsidiary of Hasbro, since 1997. The game was derived from miniature wargames, with a variation of the 1971 game Chainmail serving as the initial rule system. D&D's publication is commonly recognized as the beginning of modern role-playing games and the role-playing game industry, which also deeply influenced video games, especially the role-playing video game genre.

D&D departs from traditional wargaming by allowing each player to create their own character to play instead of a military formation. These characters embark upon adventures within a fantasy setting. A Dungeon Master (DM) serves as referee and storyteller for the game, while maintaining the setting in which the adventures occur, and playing the role of the inhabitants of the game world, known as non-player characters (NPCs). The characters form a party and they interact with the setting's inhabitants and each other. Together they solve problems, engage in battles, explore, and gather treasure and knowledge. In the process, player characters earn experience points (XP) to level up, and become increasingly powerful over a series of separate gaming sessions. Players choose a class when they create their character, which gives them special perks and abilities every few levels.

World of Warcraft (WoW) is a 2004 massively multiplayer online role-playing (MMORPG) video game developed and published by Blizzard Entertainment for Windows and macOS. Set in the Warcraft fantasy universe, World of Warcraft takes place within the fictional planet Azeroth, approximately four years after the events of the previous game in the series, Warcraft III: The Frozen Throne. The game was announced in 2001, and was released for the 10th anniversary of the Warcraft franchise on November 23, 2004. Since launch, World of Warcraft has had ten major expansion packs: The Burning Crusade (2007), Wrath of the Lich King (2008), Cataclysm (2010), Mists of Pandaria (2012), Warlords of Draenor (2014), Legion (2016), Battle for Azeroth (2018), Shadowlands (2020), Dragonflight (2022), and The War Within (2024). Two further expansions, Midnight and The Last Titan, were announced in 2023.

Inspired by other MMORPGs, particularly EverQuest, World of Warcraft allows players to create a character avatar and explore an open game world in third- or first-person view, exploring the landscape, fighting various monsters, completing quests, and interacting with non-player characters (NPCs) or other players. The game encourages players to work together to complete quests, enter dungeons and engage in player versus player (PvP) combat, however, the game can also be played solo without interacting with others. The game primarily focuses on character progression, in which players earn experience points to level up their character to make them more powerful, obtain better equipment by defeating monsters and completing challenges, and buy and sell items using in-game currency, among other game systems.

A multi-user dungeon (MUD, /mʌd/), also known as a multi-user dimension or multi-user domain, is a multiplayer real-time virtual world, usually text-based or storyboarded. MUDs combine elements of role-playing games, hack and slash, player versus player, interactive fiction, and online chat. Players can read or view descriptions of rooms, objects, other players, and non-player characters, and perform actions in the virtual world that are typically also described. Players typically interact with each other and the world by typing commands that resemble a natural language, as well as using a character typically called an avatar.

Traditional MUDs implement a role-playing video game set in a fantasy world populated by fictional races and monsters, with players choosing classes in order to gain specific skills or powers. The objective of this sort of game is to slay monsters, explore a fantasy world, complete quests, go on adventures, create a story by roleplaying, and advance the created character. Many MUDs were fashioned around the dice-rolling rules of the Dungeons & Dragons series of games.