Janusian

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A janusian is a headmate who can function as both a protector and/or a persecutor depending on the situation.

Janusian does have other meanings, unrelated to the context of this term. It can be things relating to Janus, the Roman deity of gateways and duality; or it may also refer to the ability to have multiple thoughts simultaneously.

Related Terms
Both persecutor and protector have sublabels that a janusian can identify with specifically: malicitor for the former, and swordsperson, avenger, and emotional guardian for the latter.