>Andou Oshida (brown and Japanese)
What series are these two from?
>Asami Korra (Asian and whatever water tribe was inspired by)
Fire Nation is clearly modeled after The East Asian countries (especially with their magic linking fire with te concept of chi/ki/qi), the Water Nation is a brown people living in a place with icy winters, so maybe Inuit/Eskimo?
>Angelica Susie from allgrownup (white american and African american)
Western is allowed here, loli is allowed as well, as is western loli.
>Mercy Pharah (white European and African (I kinda hoped she was from middle east))
You can be more specific, Mercy is Swiss, Pharah is likely of Egyptian heritage judging from the cultural cues like the eye tattoo, but also may be half Native American on her father's side judging from some of her alt costumes (not confirmation, D.VA has a rockabilly outfit but she's not Southern or any kind of American at all, she just likes the music).
>Do you know any other couple? Perhaps Latino
Batwoman is Midwestern and Question is Latina, they've been a couple in canon from the beginning of their appearances.
If there's not enough already, just draw your own, what's a nice combination?
How about some historical couples? Starting with some dom/sub dynamics enabled by literal slavery and oppression.
Arab and European from during the Islamic Occupation of Europe, and the Barbary-Ottoman Slave Trade.
African and European from the Trans-Atlantic Slave Trade and European Occupation of Africa.
Asian and European from the Mongol Empire raiding and pillaging of European countries.
Native and European from Native tribes raiding and pillaging settlements and taking settler slaves.
Indian and European from the British Occupation of the Subcontinent (India and Sri Lanka).
and more modern examples that came with high-profile cross-racial wars from the world wars to today.
WW2: American/Australian + Japanese
Cold War: White + Asian (Korean/Vietnamese), White + Latino (Cuba/Columbia), White + Arab (Iraq/Afghanistan), White + Black (Congo/Somalia).
Post-Cold War: Middle East Wars, Alt-Right Rising, etc.
Heck, if you'll count it, WW2 would allow for German/Romani, German/Jewish, and Russian/Sami.