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The AI characters can "care for themselves" according to project leader Roman Campos Oriola; enemies will be aggressive, moving around objects and the environment to attack the player (like jumping on a table instead of running around). The developers hold the computer game F.E.A.R. as their standard for the AI.

The AI will also be completely unique, with an option that allows the player to force the enemy mob bosses to surrender, rather than take their lives. This is done by disarming the boss and holding them at the player's mercy instead of killing them. (A Game Informer article mentions this can be done by stopping the katana's swing a fraction of a second before it could inflict a killing blow, or shooting the gun out of their hand.) This actually becomes beneficial, as the bosses may then help the player if the player can convince them to join the player's faction, possibly handing over new weapons or paths. A violent approach will also be possible, but it will not be as beneficial, wise, or encouraged. The bosses' factions may actually join Tokai (instead of the player) in his quest for Yakuza control, making the final confrontation with the mobster more difficult.