I keep reading this thread thinking back to the time I used Mahershala Ali as a PB and my friend (black guy) played his petite white (blonde) girlfriend and it's cracking me up.
But on a personal note: a lot of my PB / char choices are my own form of escapism. On scifi games you'll often find me playing chars with a cybernetic leg (or go down a storyline with that option) because I have had surgeries, arthritis, etc in my right leg and have gone stretches using a cane. Some days I wake up, get out of bed, and my leg gives out on me. Having a personal storyline where a character can get their leg 'fixed' helps me.
Most of my female PCs are over 5'5" because I'm only 5'3" and I hate being a woman in my 30s who has to use step stools and tongs just to get shit out of her own cabinets and even then the top shelves are just unused space.
As mentioned, I don't often play chars with brown eyes because of bullying in childhood (see: Ephrath on Arx, black girl with silver eyes because fuck yeah fantasy).
My go-to on video games (since that has been brought up) is tan (wouldn't say black but I guess brown?ish?) with blue hair and silver eyes...or silver eyes and blue hair. Because why not. Blue and silver are my favorite colors.