One thought for me is that games, especially RPGs, tend through in new characters to generate new quests, whereas all film and novel writing advice suggests paring down the characters to the minimum required. If you can combine roles, or eliminate them, the narrative becomes sharper, the characters become more meaningful and emotional resonance easier to achieve.

In games, we seem to seek to maximise the number of characters (which is why, I think, RPGs tend to focus their "character" efforts on party members). If we went the other, minimalist, way, all of sudden we may find it easier to have character interactions we believe in.
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