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Creating Non-Player Characters (NPCs) that can react robustly to unforeseenplayer behaviour or novel game content is difficult and time-consuming. Thishinders the design of believable characters, and the inclusion of NPCs in gamesthat rely heavily on procedural content generation. We have previouslyaddressed this challenge by means of empowerment, a model of intrinsicmotivation, and demonstrated how a coupled empowerment maximisation (CEM)policy can yield generic, companion-like behaviour. In this paper, we extendthe CEM framework with a minimisation policy to give rise to adversarialbehaviour. We conduct a qualitative, exploratory study in a dungeon-crawlergame, demonstrating that CEM can exploit the affordances of different contentfacets in adaptive adversarial behaviour without modifications to the policy.Changes to the level design, underlying mechanics and our character's actionsdo not threaten our NPC's robustness, but yield new and surprising ways to bemean.

New And Surprising Ways to Be Mean. Adversarial NPCs with Coupled Empowerment Minimisation