Mónosmalet

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Mónosmalet are beings inside of the body who aren't technically a part of the system or see themselves as separate from the system, but still share the same body as the system.

They usually don't front often, or when they do, they can normally block off memories from the rest of the system.

They also may be unaffected by system members and gatekeepers, such as not being able to be forced into or out of the front, or having no passive influence.

Mónos- comes from the Greek word meaning "alone", -malet comes from the words headmate and singlet, showing that they aren't really a part of the system, but are still not a singlet.

Related Terms
Floaters are similar in that they can not be a part of one system, sort of floating between them. Walk-Ins may be a form of mónosmalet.