Plurality/Walk-Ins
From Tymestl Wiki
Walk-Ins are those who "walk into" a System after its already formed, whether they are gate-crashers or they were summoned.
Walk-Ins tend to be disoriented by this, as they are now part of something greater that has been going on for a while without them, and the rules in place and general situation are something new to them. Constructs tend to face these issues as well, just to a lesser degree as understanding is usually built-into them when they are crafted.
Of course some Walk-Ins know exactly what they are getting into and are fine with this, having already spoken to the members of the System or otherwise researched their destination, but many don't, and timesharing a body and living in Mindspace is not an easy thing to get used to.

