Understudy

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An understudy is a headmate that will take over fronting duties whenever others won’t or are unable to front. They are attached to the front and will often be close to the front at all times. Like a host, they find it very easy to switch into main front and unlike other headmates, they enjoy and often prefer to be in front.

Related Terms
Similarly, a default fronter or substitute may take over fronting duties when others are unable to.

History
This term was was coined to be traumagenic-exclusive.