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Long-Lived Characters, Local Inference: Incremental Memory Maintenance for Game NPCs

arXiv · AI, language, vision and robotics · article · Sep 16, 2026 · UTC

A game character should not have to reread its entire life before every conversation. For locally deployed language-model characters, however, revising a few memories can invalidate a long reusable prefix. The resulting preparation cost competes with both foreground dialogue and the maintenance of other characters. This matters especially when dialogue feeds game-defined actions and value judgments: a fluent but incorrect account of who owns an item, or whether a transfer has already happened, can corrupt the input to otherwise deterministic rules. We study incremental memory maintenance for l

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