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. 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.