I'm not thinking of jerk-off material, anon. Race bending characters for that feels ... icky. More ero-gore for me, please, anon-daddy.
What I intend to use them for is even ickier: AU's. I like to imagine characters from various properties existing in completely different settings
Like, as a hypothetical, the characters from Golden Girls existing in the last days of Imperial China. I'd need them to turn yellow for that shit to make sense, thus the racebending. Or for a more /co/ hypothetical, Batman, but in a North African city of the Umayyad Caliphate more than a thousand years ago. Not only would I need to change people's races, but also their ideologies, their beliefs, their backstories. Like, Alfred can be a slave kidnapped from an Italian city state, and Ra's al-Ghul can be from some other exotic foreign location, like India, or China.
It's dumb fun.