Summoner

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A summoner is a sentient headspace who has the ability to summon headmates/living things to their headspace by calling for them (verbally or not), and the called ones do not have the option to resist being summoned.

Specificity
Even though this role is independant, it may occasionally be considered a Regulator subterm, depending on the reasons of the summon.

If, for example, the sentispace desperately needs the help from specific headmates to do some emergency maintenance and summons them for this purpose, then the sentispace would be acting as a regulator.

Related Terms
The headmate counterpart of this role is a Caller.

A limited version of would be a Limited Summoner, whose headmate counterpart is a Limited Caller.

History
This term was coined on November 25th, by Pluralpedia user Oceanic-Lanterns.