I really like rival adventuring parties. One of my favorite parts of Ryoko Kui’s Delicious In Dungeon is the social aspect of having a lot of different groups of adventurers all exploring the same space. Some groups are more experienced or motivated than others, some have bad reputations, etc. Characters can start in one party and then split up and either join another or leave town entirely, whether due to some dungeon disaster or for interpersonal reasons.