Square Enix Details Gemini-Powered Chatty Slime in Dragon Quest X Online
The session shows how Square Enix keeps a 14-year-old MMORPG's worldview intact while adding a real-time AI companion, balancing prompt engineering, security, and server design.
Reporting from 1 source: ASCII.jp.
At Google Cloud Next Tokyo 26, Square Enix programmer Takatomo Sakuma detailed the Gemini implementation behind Chatty Slime, the AI adventure companion in Dragon Quest X Online. The feature uses a multi-agent system with the Gemini Live API, a security layer, and Google Cloud's Agent Runtime and Agent Development Kit. A closed beta ran from April to May 2026, with full release planned for the latter half of version 8.
Dragon Quest X Online's Chatty Slime is built as a multi-agent system, not a single AI call. Client requests pass through a security layer before routing to either an interactive conversation agent, for when the player speaks, or a spontaneous conversation agent, for when Slime speaks unprompted. Sub-agents then handle topic-specific response generation.
The raw response moves through natural language processing, emotion determination, and voice generation before passing through the security layer again on the way back to the client. Each agent connects to the memory service and registry of Google Cloud's Agent Runtime, with future knowledge expansion via RAG anticipated.
Sakuma said the team considered standard TTS but found it lacking for a game character. The Gemini Live API allows adjusting unique sentence endings, intonation, and energy levels through prompts. Development uses Google Cloud's open framework Agent Development Kit, which lets agents be built by combining sub-agents, tools, and memory management.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.