A good adventure site will be populated with at least two factions of creatures. These are not necessarily the factions working at your hexcrawl level, though these should inform your choices. The factions should have competing goals they are trying to achieve within the adventure site. Not all of the creatures within the adventure site will be part of these factions.

One of the factions in the site may already be clear from rolling the Denizens in the adventure site overview. The other faction could be protecting the site from that faction, or competing for a similar goal.