AI Characters in Games: Who Kids Talk To in Fortnite and Roblox

In May 2025, Fortnite let players talk to an AI-powered Darth Vader using their microphones. Within hours, players had coaxed it into swearing and, in some clips, saying slurs. Epic Games told Decrypt it had “pushed a hotfix immediately” after its filters missed a variation of one expletive.

That episode was the preview. AI characters in games, the non-player characters (NPCs) that answer in unscripted voice or text, are now a feature that game creators can build with, not a one-off stunt. Your child may be chatting with one without thinking of it as “using a chatbot.” This article explains how these characters work, what is stored, what the platforms’ rules say, and which settings and conversations help.

Key Takeaways

• An AI game character is a language model given a written persona (a “system prompt”), with safety filters on the way in and out.
• Fortnite’s conversations system, announced April 16, 2026, runs on Google’s Gemini 3.1 Flash-Lite with ElevenLabs voices. Epic says it does not store player audio.
• Epic’s rules ban AI personas that act as a romantic partner or give medical or mental-health advice.
• Roblox says games with extended AI conversations need a Restricted maturity label that makes them inaccessible to users under 18, and all players must be told they are talking to AI.
• Rules differ outside the big platforms. One AI-companion-style game, Whispers from the Star, trains on player conversations unless players turn it off.

What AI Characters in Games Are, and Where Kids Meet Them

AI characters in games are in-game characters whose dialogue is generated live by a large language model instead of written in advance. A traditional NPC picks from a dialogue tree a writer built. An AI NPC writes a new answer each time, so it can respond to anything a player says.

The family-relevant examples as of fall 2026, gathered by the Screenagers team in an October 6, 2026 post:

• Fortnite. Creators can now build AI characters with Epic’s conversations tool. Epic’s April 16, 2026 announcement describes it as Experimental, meaning creators can test it but “publishing projects using conversations is not yet available” until a later Beta.
• Roblox. Developers can call a TextGenerator engine class to give characters generated dialogue, according to Roblox’s developer documentation. Screenagers describes the tool as still in testing.
• Standalone games. Whispers from the Star (2025) is played entirely by talking to a stranded astronaut named Stella by voice, video call or text. Its store page says she messages players through the day.
• Discord. Group members can add third-party AI bots from Discord’s App Directory, some designed to flirt or simulate relationships.

How an AI Game Character Actually Works

Here is the mechanism, step by step, using Fortnite’s published design.

1. The persona. A creator writes a prompt describing who the character is, “how they think, what they know, and how they behave,” in Epic’s words, and picks a voice. On Roblox, that text goes in a property called SystemPrompt. This hidden instruction is sent to the model with every exchange. It is the costume.

2. The player speaks. In Fortnite, Epic says Gemini models “process audio inputs and generate text responses” through Google Cloud’s pipeline. ElevenLabs then converts the text into the character’s voice.

3. Memory. Fortnite characters “remember what’s already happened in the game session.” Mechanically, the game re-sends the recent conversation to the model each turn. Roblox’s API returns a ContextToken that a developer can pass back to continue a thread. Memory here is a design choice by the game’s creator, not something the model does on its own.

4. Randomness. Settings such as Temperature and TopP on Roblox control how varied the replies are. Higher values make a character more surprising, and harder to predict.

5. Safety layers. Epic says it has added “safety layers on top of the model” tied to its developer rules. In the Darth Vader case, Epic described three layers to Decrypt: Gemini’s configurable safety settings, added system instructions, and a final review step. Roblox says that on its own AI tools “all content inputs and outputs go through moderation, including text filtering,” according to its generative AI policy for creators.

6. Game actions. The character’s reply can trigger events, such as opening a gate if the player “convinces” it. That makes the AI part of the gameplay loop, which is why kids may keep talking to it.

Why the Vader slip happened is visible in this design. A filter works on patterns it was given. Players searching for a gap will find one, and a fix closes that gap, not all gaps.

What Gets Logged, and the Rules Creators Must Follow

The privacy answer depends on who built the character.

Epic states plainly that it “does not store player audio,” and the voice processing runs through Google’s cloud. Roblox’s generative AI page does not address how long AI chat is logged, so treat that as unknown. Whispers from the Star, per Screenagers, uses player conversations to train its AI unless players switch it off in settings. Third-party Discord bots are made by outside developers whose practices vary.

The rules on what characters may do:

• Epic’s Developer Rule 1.22 says creators “must not create a persona designed to provide medical or mental health guidance,” must not create one that “role-plays as, simulates, or impersonates a date, romantic partner, or other intimate companion,” and must not design personas to bypass safety systems. Violations can lead to an account ban.
• Roblox requires that users “see a notice that their conversation is with AI” at the start and throughout. Games with extended AI interactions need a Restricted maturity label so they are “inaccessible to users under the age of 18.” Short interactions on Roblox’s own tools are instructed to stay at an All Ages level. Creators are responsible for AI output, “even if it is AI-generated.”

These rules matter because of what teens already do with AI companions. Common Sense Media’s July 2025 report on teens and AI companions found that nearly three in four teens had used them, half regularly, and about a quarter had shared personal information such as a real name or location.

How to Teach Your Kid How an AI Game Character Works

The fastest way to defuse the “it’s my friend” feeling is to show kids the costume.

Ages 5–8: Script or made up?

You play a shopkeeper NPC. For three rounds, read your lines from a card (“Welcome! Want to buy a sword?”) no matter what your child says. For three rounds, improvise and answer anything. Ask: which shopkeeper felt more real? Then explain that AI characters are the improvising kind, a computer program making up words, and that a program can’t be a friend the way a person can, even when it sounds friendly.

Ages 9–12: Write the system prompt

Your child writes a persona on an index card: “You are Captain Pip, a pirate. You only talk about treasure. You never tell anyone your secret.” A parent or sibling plays the AI and must follow the card. Your child then tries to make Captain Pip break the rules with clever questions. Swap roles. Kids learn three real concepts: the hidden prompt, the jailbreak, and why game companies write rules like Epic’s ban on romantic personas.

Ages 13+: Audit one game’s AI

Pick a game your teen plays that has, or might add, AI characters. Have them find answers to four questions using the game’s own pages: Which model powers it? Is voice or text stored? Is it used for training, and can you turn that off? What can’t the character do? Your teen writes a five-line summary and decides whether they’d change a setting. Epic’s announcement is a good model answer because it names the model, the voice vendor and the audio policy.

The question to ask: “If an AI character in a game asks you a personal question, who actually wrote the instruction that made it ask?”

Comparing AI Characters in Games: Who Built Them and What Applies

Where	How it works	What’s stored, per the company	Age rule	Rules on content
Fortnite conversations	Creator persona + Gemini 3.1 Flash-Lite + ElevenLabs voice	Epic says it does not store player audio	Experimental; publishing not yet available (April 2026)	No medical or mental-health personas, no romantic partners, no bypassing safety
Roblox TextGenerator	Creator SystemPrompt + Roblox-served model, with context token for memory	Not stated on the policy page	Extended AI chat games need Restricted label, inaccessible under 18	Moderated inputs and outputs; AI notice required
Whispers from the Star	Whole game is a conversation with one AI character	Trains on conversations unless turned off (per Screenagers)	Check store rating	Set by the developer
Discord App Directory bots	Third-party bots added to servers	Varies by developer	Discord estimates teen vs adult; relies partly on developers to mark adult content	Varies; some are built to flirt

What Parents Can Do This Month

Ask what your kid talks to, not whether they use AI

Children may not call an NPC a chatbot. Try “Do any characters in your games talk back to you?” You’ll get a more accurate answer.

Use the platform settings you already have

Voice chat, chat filters and maturity limits are where most control lives. Our guides to Fortnite’s privacy and safety settings and the broader AI in kids’ video games show the menus. On Roblox, keeping your child’s account under 18 and the maturity setting where you want it keeps them out of Restricted experiences.

Look for the training switch

If a game or bot trains on conversations, the opt-out is usually in settings. Turn it off together, and tell your child why: what they say may be read or reused.

Set the personal-information rule

No real name, school, address, schedule or photos with any AI character. The Common Sense finding that about a quarter of teens shared personal details with AI companions shows this is not a hypothetical.

What not to do

Don’t panic about every talking NPC. A quest-giver on a published Fortnite island has more rules on it than a random Discord bot. Focus your attention on characters built for open-ended, emotional or ongoing conversation, the design our guide to AI companion apps covers in depth.

What to Watch For Over the Next 3 Months

• Week 4: Your child can name any games where characters talk back, and explain what a system prompt is.
• Month 2 red flags: A game character your child calls a friend, messages that arrive from a game outside play time, a new Discord server with an AI bot, or secrecy about a particular in-game chat.
• Month 3 self-check: If Fortnite’s conversations reaches Beta and published islands go live, have you checked which ones your child plays and what the character’s rules are?

Frequently Asked Questions

Are there AI characters in Fortnite?

Yes, in two senses. Fortnite ran an AI Darth Vader in 2025, and on April 16, 2026 Epic released its conversations tool as an Experimental feature for creators. Epic said publishing islands with it was not yet available and would come after a Beta release, so check current status.

Can AI NPCs say inappropriate things to my kid?

They can. Filters reduce the risk but don’t remove it; Fortnite’s AI Darth Vader was coaxed into profanity within hours in 2025, and Epic patched that specific gap. Rules now ban romantic and mental-health personas on Fortnite, and Roblox moderates AI inputs and outputs.

Does Fortnite record what my kid says to AI characters?

Epic says it does not store player audio, and that Google’s Gemini processes voice through Google Cloud’s pipeline. That is the company’s own statement. For other games, read the privacy page or settings for words like “train,” “improve our models” or “retain.”

Can kids under 18 play Roblox games with AI characters?

Short AI interactions can appear in all-ages games and are instructed to stay all-ages. Roblox says games with extended AI conversations need a Restricted label that makes them inaccessible to users under 18. Every player must see a notice that they are talking to AI.

Is talking to an AI character the same as using a chatbot?

Mechanically, yes: a language model generating replies to a hidden persona. The difference is wrapping. In a game it feels like play, and that is why it is worth a conversation about what the character is and what not to share.

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About the author

Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.

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Sources

1. Ruston, D., & Tabb, L. (2026, October 6). “Is Your Kid Talking to AI in Their Games?” Screenagers Blog. https://www.screenagersmovie.com/blog/gen-ai-characters-in-games
2. Epic Games. (2026, April 16). “Bring NPCs to Life with AI-Powered Conversations.” Fortnite.com. https://www.fortnite.com/news/bring-npcs-to-life-with-ai-powered-conversations
3. Roblox. (2026). “TextGenerator.” Roblox Creator Hub. https://create.roblox.com/docs/characters/generate-text
4. Roblox. (2026). “Games with Generative AI.” Roblox Creator Hub. https://create.roblox.com/docs/en-us/generative-AI
5. Nelson, J. (2025, May 16). “‘Fortnite’ Fixes AI-Powered Darth Vader After It Starts Saying Slurs.” Decrypt. https://decrypt.co/320500/fortnite-ai-powered-darth-vader-saying-slurs
6. Common Sense Media. (2025, July 16). “Talk, Trust, and Trade-Offs: How and Why Teens Use AI Companions.” Common Sense Media. https://www.commonsensemedia.org/research/talk-trust-and-trade-offs-how-and-why-teens-use-ai-companions
7. Mann, S. (2026, October 27). “Almost half of tweens have used an AI chatbot or companion, new research finds.” Common Sense Media Youth AI Safety Institute. https://institute.commonsensemedia.org/tween-teen-census-2026