I just read the text of "Commuanl Shower", a card spoiled on the cénacle for the next AP "Thing from the Shore" it says :
F88 : Players cannot commit characters they control from different factions to the same story.
(Go there to see the card)
So dod we consider neutral characters to be part of a distinct faction (the Neutral faction) or do we consider the neutrals being of-factionned ?