Antagoniser

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An antagoniser is a headmate whose morals don’t align with most or all other system members.

This could be in big or small ways and it doesn’t have to disrupt system life, but could.

They could also just be seen as a small annoyance rather than a disturbance, but that doesn’t have to be the case either.

It all depends how they interact with the other system members and how those other members handle their differing morals.