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; specifically, outernaut.

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. A co-host (or perinaut) is exactly what it sounds like: a headmate that, with others, shares the hosting role. It is also not to be confused with main.