Also I've realised Ming Hua also has very light skin for a waterbender, as well as black hair and brown eyes.
There were many light skinned water tribespeople (ex Pakku), those with dark skin appeared to be mostly in the south, & even then, it wasn't 100%.
Then we have Noatak, who became much paler after living underground for however long.
I think Ming Hua and Hama are related. I hope we see some connection in Korra comics.
Having the same skintone hardly means you're related; Princess Yue was light-skinned as well, but I doubt she's related to either of them.
That could happen! I heard that during the early designs of Ming Hua, Mike and Bryan were considering on making her a bloodbender.
Tahno is probably a multiethnic native of the United Republic. Fanon, at least, seems to posit both Hasook and Ming-Hua as swampbenders.
And I'm not sure where the idea that Ming-Hua had brown eyes came from. P'Li had brown eyes; Ming-Hua's were sort of slate blue.
As far as skin goes. Since plastic surgery a thing in Republic City. We could go the unnatural way and say he got a melanin treatment? We don't know Republic City's beauty standards ether. yeahhh no. The interesting answer to me is that he just has a mixed bending family *gasps* Maybe his grandparents were a forbidden water-fire romance and ran away to Republic City! Hahaha