Host

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A host is the headmate who is most active, most responsible for day to day activities, or otherwise is fronting most often. Not all systems have hosts, and some may have a rotating team for the role. In addition, some do not like the term "host", and choose to use alternatives.

Related Terms
Host is oftentimes confused for "core", because in some systems, one headmate is both. The former can be any headmate of any origin, while the latter refers to a body's native personality; both may or may not exist in a system, though, and a system without a host can be labeled as a collection. A co-host (or perinaut) is exactly what it sounds like: a headmate that, with others, takes the hosting role. It is also not to be confused with outernaut or main.