The decision about who will be the dungeon master (DM) can happen in different ways:

1. Previous agreement: Players may have discussed beforehand or agreed upon a specific person who would take on the role of the DM. This could be because someone has experience with running games, wants to try it out, or simply because they volunteered.
2. Rotating DM: Players might decide to rotate the DM responsibilities among themselves after each session or every few sessions. This way, everyone gets to experience both playing a character and creating the story as the DM.
3. Random selection: If no one has agreed on who should become the DM, players can randomly select the first DM from the group using methods like drawing straws, rolling dice, or flipping coins. Subsequent DM rotations can then follow the same method or switch up to accommodate newcomers.
4. Choose based on preferences: Players might discuss the type of campaign they want to play, such as combat-heavy versus roleplaying-focused, high fantasy vs gritty realism, etc., and then choose the DM whose strengths align best with those preferences.

In Dungeons & Dragons (D&D), there are two broad categories of characters: player characters (PCs) and non-player characters (NPCs).

1. **Player Characters (PCs)**: These are the characters played by the players at the table. Each player controls one or more PCs, which they design and develop following the D&D rules and guidelines. PCs can belong to any of the available races and classes and possess unique personalities, backstories, and abilities.
2. **Non-Player Characters (NPCs)**: These are characters controlled by the Dungeon Master (DM) or narrator. They can range from minor acquaintances and passive townspeople to major antagonists and formidable adversaries. NPCs fill numerous roles, including sidekicks, quest-givers, informants, enemies, bosses, and even romantic interests. Some notable NPCs, called iconics, are officially recognized figures within the D&D universe, representing key aspects of their respective races or organizations.
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