Any Strange Artifacts from other dimensions have no power until legislated by Proposal. Sometimes, a player from Fascist Game Seven might be dumped at Atlantis docks in a black bag. This only takes effect if communication from Fascist Game Seven has been received to that effect. A person may run only one native player, but may run any number of visitors. Visitors must have an unique name, so you can't for example have 2 Tivols.
Visitors are subject to the same rules as normal players and can make proposals.
However, they do not automatically start with a ship even if the current number of ships is under the limit. They get to keep their Strange Artifacts that they had with them. People might also sail out from Fascist Game Nine. The only difference between visitors from there and visitors from Fascist Game Seven is that visitors from Game Nine already have a ship, which exists independently of the 21-ship limit. They must choose a side and paint their ship in a decent colour before making any proposals.