Terminology I use
Frequent Flyer(s): Alters that front the majority of the time, or are very common in our life.
Alter: A person in a system.
Fragment: An alter that has little elaboration. Most commonly, they hold single memories, emotions, or can only perform their "job."
Protector: Protectors are alters that protect the body, system, host, or other specific alters or groups of alters.
Host (& Co-Host): Host alters are responsible for most aspects of daily life.
Littles: Another name for child alters.