I think much of the appeal comes from the conflict between the personal/emotional relationship that pulls the characters together, and the sense of morality/duty that pulls them apart.
Oh yes, that is a good one, and something I like when it comes to the opposing sides where there is history between the characters which adds to the complexities. They were once friends, or they were enemies but have since become friends but certain loyalties to their sides or personal ideologies and beliefs keep them apart in certain ways. It's a fantastic trope to play around in. And as you said, it doesn't have to be romantic, just simply a strained or quite complicated relationship.
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I think much of the appeal comes from the conflict between the personal/emotional relationship that pulls the characters together, and the sense of morality/duty that pulls them apart.
Oh yes, that is a good one, and something I like when it comes to the opposing sides where there is history between the characters which adds to the complexities. They were once friends, or they were enemies but have since become friends but certain loyalties to their sides or personal ideologies and beliefs keep them apart in certain ways. It's a fantastic trope to play around in. And as you said, it doesn't have to be romantic, just simply a strained or quite complicated relationship.