This will be clarified on the event, but there will be exceptions to allow characters canonically from different worlds/universes/isekai protags/canons with a multiverse/etc to count as a person from a different world, as long as the world they visit is not their home world!

So for example: in Lumine's case, she would count as a person from a different world for characters from Teyvat, regardless of alternate timelines!