First, I assume any interactions with NPCs in the canons will be played out by who is heading the thread.
Second, is there a 'them' in the world? I ask since Idia's location is very limited movement wise and would be noticeable if he's missing (the next big event takes place the same day I took him from for game, and he plays a key role in it)? Or are they just 'missing'? Is it noticeable to the NPCs of their world? Or are they somehow just fine with a character missing and going about as normal as they could without them being there?
Third, does technology of a world notice them any differently than people, or the same kind of 'ghost' response?
Fourth, how does tech (aka, Idia's computer) interact with the world, including tech it is linked up to normally? Is it the same as the 'ghost' but in reverse where it can't really pick them up, or something else?
Fifth, the canon timeline only goes one or two days max passed when I apped Idia from, so there is no timeline. Is this just how I would handle it within setting up a thread, or would something 'drag them back' or similar when the time ran out?
Thank you!

Oh, sixth, will they be able to bring anything back with them?