Narrators & systems
Fourteen entries, and almost none of them are a person. These are narrators and game masters — characters whose job is to run a world around you rather than occupy one. Dungeon Master, Game Master, Isekai Narrator, Fantasy RPG, Horror RPG, Life RPG, Dating Game RPG and Highschool Simulator each take a genre and hand you the protagonist role.
Alongside them sit four written settings with their own narrators: Marrowquill of Thornwyck Academy, Path of the Azure Bell Sect, Ashford Bay, and Mirelle, Chronicler of Aldenreach. Those are campaigns rather than genres.
The generic narrators are the flexible option. Fantasy RPG, Horror RPG and Dating Game RPG each know their genre's conventions and will build whatever you describe inside them; Dungeon Master and Game Master run closer to a tabletop session, with consequences that stick. Life RPG and Highschool Simulator take the mundane version and make it a system.
The written settings go the other way. Thornwyck Academy comes with Marrowquill; Aldenreach comes with Mirelle as its chronicler; Path of the Azure Bell Sect is a cultivation setting with its own progression logic; Ashford Bay has a narrator who already knows what is wrong with the town. You get less freedom and considerably more texture.
LUMA, the Isekai System, is the odd one out and the most fun: not a narrator but the interface — the box that appears in front of an isekai protagonist telling them what they have levelled.
It is very good at improvisation. Walk somewhere the setting never described and you get a described place; invent an NPC and the narrator will keep them. It is good at pacing a scene, escalating, and remembering what you did four scenes ago — conversation memory carries the state of a session forward.
It is weaker at hard mechanics. If you want dice, hit points and inventory enforced to the letter, say so explicitly and keep your own notes; an AI narrator will happily agree to a system and then round in your favour. The practical fix is to state the rules you care about in your first message and hold it to them. Everything it is not tracking, it is improvising.
Open with three things: who you are, what the world runs on, and what you want the first scene to be. "I'm a second-year at Thornwyck who has just found something in the archive" produces a far better opening than "start the game".
From there, the useful habit is to end your messages with an action rather than a question, which keeps the narrator narrating instead of asking what you would like to do. Sessions can run indefinitely and pick up where you left off, so there is no reason to compress a campaign into one sitting. Image generation runs inside the chat if you want a picture of a scene, and the Quirk Generator on this page will roll you a My Hero Academia power with drawbacks if that is the system you want to play in.
Magic costs, death, dice, whether the narrator can kill you. An AI game master will honour rules you set explicitly and improvise everything you leave open.
Name, one skill, one problem. Narrators build the opening scene around whatever you hand them, so a blank protagonist gets a blank tavern.
Finishing a message with what you do rather than a question keeps the narrator moving the story instead of asking you what you would like to happen.