In their respective fandoms, though, they dominate. As someone in Criminal Minds fandom, while it's a close thing, I can say Morgan/Reid is more popular than Hotch/Reid. A popular het pairing in the fandom is also Garcia/Morgan, which is also interracial. I only used Morgan/Reid and Travis/Wes (which only had one season so far, btw) as an example because I'm familiar with them (I ship both pairings myself) and they're the ones that had already been mentioned. Other people have listed pairings below, all of which probably (the ones I recognize, definitely) have POC characters just as integral to their plot as their white ones, which is probably why they play a bigger part in their fandoms.

I'm going to list as many others as I can, which come to mind: Ryan/Esposito in Castle; Zuko/Katara from ATLA and Korra/Bolin/Mako/whatever from LoK; Brittany/Santana on Glee; Eliot/Huang on Law and Order SVU, Virgil/Ritchie in Static Shock; Jacob/Edward in Twilight; Troy/Abed from Community - and etc because there's more. All are moderately popular in their respective fandoms. Some are most popular. And no, racism isn't just something experienced by slash fans. That so many POC characters are underrepresented in their source material is a problem, and at least partially why they're underrepresented in fandom as a whole, not JUST by m-slashers (in case you're the same person who said they were to blame in a lower thread).