Malicitor

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A malicitor is a system member who abuses other members in one or more ways for their own enjoyment or benefit. In some cases, they may be difficult to reform and dangerous to show vulnerability towards.

A malicitor may be "passive" if they do not harm others unless provoked. However, they may be very easy to provoke.

Related Terms
A persecutor is another term describing a headmate who harms others.

A protector may be protecting the rest of the system from the malicitor.