Perinaut

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A perinaut is an alternative to the term co-host. It's a headmate who is not necessarily in charge of daily life, but is still performs an integral external role. They may orbit the front frequently too. A system may have one, two, fluid, or no perinauts.

History
Perinaut was created specifically for the Blossom bot, but after the shutdown, the Future Hope Collective created a coining post for their terms, to create a proper citation.

Related Terms
It was coined with the term outernaut, but the suffix has been used later on with dissonaut & bionaut. It seems to be based off "astronaut", as they are both individuals who explore and exist in outside worlds; whether it be space, or the shared reality.

Some systems have issues with the term co-host, as it can imply a certain hierarchy in the collective.