Here's what we did:
We made me black.
A black man was sitting in the witness stand, and all of a sudden teams had to reckon with that blackness in a way they'd never been asked to.
Nobody knew what to do! Except hope that when sides were assigned, our team was the defendant. (We killed it on that side too.)
After that year, the rulemaking body passed a new rule.
It is now forbidden to mention or allude to a character's race in your case-in-chief.
What does this have to do with worldbuilding?
The story that was told inside that room contained the lives that were lived outside of it. Lives that were unimaginable to the majority-white participants.
It's the people moving through it. Does it have to make sense? Well, racism doesn't make sense. But it is a governing logic--
So what I've found helpful when building a world is to center its people. That is ultimately what the story is about.
Because you can't put a magic system on trial.