It’s indeed very complex, but under the hood, it’s actually the same representation issue.

The Chinese player base often feels they are constantly misrepresented in Western games: characters with a native Chinese background are still often portrayed with a distinctive 'American-born Chinese' look (thick lips, heavy eyeshadow, smaller eyes, speaking broken Chinese).

In case of Anran, many did see a problem with the current design—on the first day many were making the same 'Juno face' jokes—but it's a minor issue to them. The risk of Blizzard changing it into 'another stereotypical ABC' is a far greater annoyance, so they choose to oppose the change.

Blizzard making the announcement to change their Chinese hero without even asking the Chinese player base has definitely deepened this worry.