Role-playing games have always depended on characters who respond to the player: the innkeeper who gives rumours, the guard who blocks the gate, the rival who taunts you. In most video games those characters follow written scripts with a limited set of lines. A new group of platforms lets players build their own game worlds and fill them with characters whose replies are generated by language models. The idea is exciting, and it also has clear limits.
How these platforms work
You describe a setting and a cast: a rainy port town, a retired smuggler, a suspicious priest. The platform feeds that description to a language model as background. When you talk to a character, the model writes a reply that fits the personality you described and the conversation so far. Some systems add memory so a character can refer to earlier events, and some add images or voices.
Compared with classic dialogue trees, this gives you open-ended conversation. You can type any question and get a reply.
Where it shines
- Freedom. Players are not limited to three pre-written choices. They can try odd ideas and get a response.
- Creation. Anyone can build a world without programming. This appeals to tabletop fans who run their own campaigns.
- Replay value. Because replies vary, the same scene can feel fresh each time.
- Small teams. Indie developers can fill a world with talkative characters without writing thousands of lines.
Where it still fails
The weaknesses are well known by now.
- Consistency. A character may forget details, change personality, or contradict earlier statements, especially in long sessions.
- Game logic. A model writes text, but it does not enforce rules. It may let you pay with gold you don’t have or describe an item that doesn’t exist in the game’s data.
- Pacing. Open conversation can wander. Good games need tension, and a model has no sense of a story’s shape unless it is carefully guided.
- Repetition. After enough sessions, you can spot the stock phrases a model likes.
- Safety and quality. Generated text can produce inappropriate or nonsensical content, so platforms need filters and moderation.
What good design looks like
The better examples treat the language model as one part of a larger system. A conventional game engine tracks inventory, health, quests, and locations. The model is given only the relevant facts and asked to speak in character. Its output may be checked against rules before the game acts on it.
Writers still matter. A strong setting, clear character goals, and a few firm secrets give the model something to hold on to. Weak prompts produce bland talk; sharp ones produce memorable characters.
Costs and practicalities
Running a language model costs money for every message, so platforms may limit free use or charge subscriptions. Response speed also matters: a pause of several seconds can break the feeling of conversation. Some games run smaller models locally to cut delay, accepting lower quality.
Questions for creators
- Who owns the worlds and characters you create, and what can the platform do with them?
- Can you export your story or save it somewhere else?
- How does the platform treat your conversations, and are they used to train models?
- What content rules apply, and how are they enforced?
Tips if you want to try one
Start with a small setting and two or three characters. Write short, concrete descriptions, including what each character wants and what they refuse to say. Keep notes outside the system about key facts, so you can remind the character when it drifts. Treat the output as a collaborator’s draft, and edit when you want a scene to land.
If you run tabletop sessions, you can use these tools to prepare non-player characters, then bring the best lines to your group.
Bottom line
AI-generated characters make role-playing worlds more open and cheaper to build, but they do not replace design. They work best when a solid game system and good writing hold them in place. Expect fun experiments, occasional nonsense, and steady improvement.
A short example session
Suppose you build a harbour town and add a ferry captain who only speaks in short, grumpy sentences and refuses to name his passengers. In a good setup, you ask him about a missing crate, he deflects, and the game quietly marks a clue as discovered only if you present the right item. The model supplies voice and colour, while the rules decide what is true. That split keeps the story coherent and makes mistakes easier to catch, because you can test the rules without reading every line of generated dialogue.
Further reading
Related on this site: A Free Streaming App Is Shutting Down: What to Do Before It Goes and Most-Followed TikTokers and How Creator Brand Deals Actually Work. For general background, see the Wikipedia overview.
