Lockettes are either the first or the second extra-terrestrial species encountered by Dextroluma, depending on who you ask.  However, due to the fact Dexettes (who come from the souls of deceased Dextroluma) manifest in Maquette alongside Lockettes, many Dextroluma don’t consider them aliens so much as cousins and would not even count them on the list.

Dextroluma may travel freely to some spheres of Maquette, although not every sphere is suited to organic lifeforms.

Lockettes may travel freely to Aerius, however, access to nations other than the Blighted Wilds is generally managed through the Aerius Passport Office, who grant official documentation to lockettes for legally allowed travel.  Lockettes caught illegally in Aerius may face consequences... if the authorities can actually remove them, of course.  The Passport Office does permit possessed lockettes to come to Aerius, but they evaluate them far more intensely than others of their kind.

Dexettes may travel freely to Aerius, although it is recommended for them to obtain a passport, particularly if they have summons.

Lockettes and Dexettes are both on site, and more can be learned about them in their lore books when those launch.