One goal in Vanilla Enhanced is for AIs to use unique bonuses like a human would. A human playing Alexander will typically ally with citystates and attack major civs. There's several factors I used when determining a personality: What were the leader's vanilla AI stats? Does the leader have militaristic bonuses? Did the civilization historically involve citystates or confederations? Approximately the same number of leaders assigned to each personality type. In addition to what's listed in the table below, there's other things involved. For example, the "conqueror" personality type values military strength above all else, so they might backstab you if they sense weakness, even if you're friends. Some leaders have additional tweaks encouraging the AI to better use their unique traits/units/buildings. An AI's personality type determines its leader priorities. .