What exactly can a visitor do in my multiverse?

Once you've approved a connection, there's one ability that's always on and three you switch on individually — every one of them off by default until you say otherwise, from Manage Access in The Nexus.

Always on: unlock

A visitor can spend their own credits to unlock a locked character in your realms. This is the one ability that can't be turned off for an active connection.

Optional: summon

Lets them add a new character to one of your realms, the same as you could yourself.

Optional: create realm

Lets them branch a new sub-realm off one of yours.

Optional: save image

Lets them save a character's art to their own device.

A visitor never gets access beyond your own chart — no changes to your credits, your Settings, or realms you haven't shared.