Viera can be different from Miqo'te.

[Nestama]

You can say the same for FFXIV's races, except for the Mithra being more "feral" and Galka having tails. Are you implying that Elezen aren't elves but humans with elf ears? Because that's what basically an elf is.
It's actually pretty funny that you mention Tarus being onions while Lalas are often called potatoes.

I call them onions because of the Star Onions (also their hairstyle options). As for Elezen,they used to be their own thing, but then the male Au Ra came along and kinda shared their silhouette (much like how the female Au Ra share a sillhouette with Miqo'te. This was, or rather, still is my main dislike towards Au Ra and why I'm against the Viera. The female Viera will probably share a similar silhouette with the female Roegadyn, while the males will probably be a taller Miqo'te male silhouette.. Only difference being rabbit ears -and the lack of a tail). Roegadyn and Lalafells are currently the only races in XIV that look nothing like the others.