I will never understand this comment coming from a Miqo'te or Au Ra player. Never. Let's add cat ears to the Gold Saucer and delete Miqo'tes from the game entirely. We have head gear with horns, so no need for Au Ra. Forget their unique emotes, lore, and just overall aesthetic. People only care about 'dem ears, so just get rid of them and let us all be Hyur that wears specific ear gear. Same with Elezens given the recent thread: delete Elezens and just give Hyurs and Roes ear extension glamour.
I apologize for the sarcasm, but this really is the worst argument against any new race. And coming from a player of a cat girl or lizard girl, it just screams hypocrite.
Anyway, on topic: I admit I'm not very familiar with Viera (haven't really played the games with them in there). Given all the images I've seen, I definitely feel like their builds (if they went with Fran) would definitely lean towards a more warrior race. Perhaps from a region in the mountains as their legs would be ideal for traversing the heights and crevices. Story wise though what if they actually sympathized with the Empire? Like perhaps their tribes were actually nearing extinction and so the Empire offered protection and help in exchange for something? So like when we meet the first tribe they're actually quite hostile, but there's a few key NPCs that would help you or help you earn their trust. For those that want the cute Viera, you could have the more warrior clan be the taller, elegant version while the smaller ones are the domesticated citizens that went to live within the Empire itself.
Or it could be possible that one clan of Viera (tall warriors) despises the Empire for splitting their already scarce race apart and considers the other clan traitors for willingly assimilating and throwing away their heritage. While the smaller/cute clan that's from the empire would look to the warrior clan as dumb savages that are doomed to die.
That said, I haven't finished HW yet, so I'm going off an incomplete understanding of lore (so I apologize if this clashes with what we have).