I think SCU shadow should project the trope of “ I have every reason to hate the world and watch it burn, I don’t choose to hate, the world has given me no other option, I rage because the world deserves it” . While sonic carries out the trope of “ I will choose to love, the world is full of choices, and results we can’t always control, and every time, I will choose to love.” I think they should be so deeply committed to their views on the world , right up until they meet, and suddenly their views on the world are thrown out of whack, they’re scared , they’re confused, they’re trying to carry out their missions and heroic duties while struggling to understand the other, they can’t instantly comprehend how the others view has stayed the way it is. And that level of fear and frustration gets stronger every time they interact, or battle. And they remain in that trope for most of the movie, slowly getting to the point where they either understand the others point of view, or they just give up on trying to make the other understand at all.