1. Will creatures with a very high intrigue/divination abilities be biased towards responding to threats from the player's party more rapidly compared to AI entities, at least to a small degree, for plot purposes?
2. Will characters with a vendetta against a villain be able to offer to join your party if they find out you're directly fighting said villain?
3. Will villains be able to send agents to try and infiltrate the player's party itself, for example by pretending to be a bereaved party seeking revenge (like in 2.)
4. Similar to 3, will villains be able to try and sow discord within an entity by pitting important members against each other through false evidence and slander, up to and including the player's party?
5. Will agents of villains be able to stalk the party, interrogate people that the party has talked to for info, etc.
6. Will 'disposable pawns' be a thing for sufficiently ruthless villains? e.g. tying up loose ends by killing low-level members that have fulfilled their purpose if they know too much, setting up low-level members to take the fall for a crime, etc.
7. Will the villains do petty, not-entirely-rational villainous actions if they're particularly vicious, arbitrary and it aligns with their personality in general? By this, I mean things like:
a) Killing subordinates for minor or imagined slights, perceived failure in their duties, or if they're unhinged enough, just for the heck of it
b) Dolling out disproportionate retribution to entities that have cooperated with their enemies, like butchering and burning down an entire village just because some peasant in it let the heroic adventurers stay overnight
c) Making a spectacle out of eliminating their enemies, e.g. publicly parading and then executing them, intentionally assassinating them in a brutal fashion in public, killing them in front of friends and loved ones (if said friends and loved ones are also prisoners, but also possibly keeping hostages around just to do this later if the villain expects a direct confrontation in the near future)
d) Destroying artifacts of sentimental value to their foes, if said artifact isn't too useful to them, or even destroying highly useful artifacts out of spite if they feel that their loss is imminent