Trials of Mana Character Pairings?

I know what the pairings to get more out of the story are (Duran/Angela, Kevin/Charlotte, and Hawkeye/Riesz), but does one of them have to be the main character, in order to get the most out of it? I did a run through with Kevin and Charlotte, but it didn't seem that they really interacted much. But, I'm wondering if this is because I used Duran as the main character, and not one of them. Or is the difference just super negligible? 

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