Eh, I wouldn't be surprise if they just put hume ears on an elvaan model then added some unique hair styles.
I can't quite say I agree with an earlier poster and the implication that NAs favor anthropomorphic races, though. Furries get a bad rap. Next to humans, elves probably take second place by basically being human with pointy ears. Beyond that, you tend to get more game-specific where race choice tends to tie into faction choice, as well. I can't see most people picking an Orc in WoW because they thought Orcs were awesome, but rather, they wanted to be "the bad guy" from the lore perspective. Same with Aion and the Asmodians (Though NCSoft didn't help here in giving their race some favorable things...). From there, some just go by cute factor or sexual arousal, the latter working more in a Mithra's favor not so much because they're catgirls, but because their outfits are skimpy and movements may catch an eye.
It's still fun watching furry-phobe mithra fanatics flounder when you try to tell them mithra have fur all over. The preference of the fan art world also speaks volumes in that they're often depicted as humans with the ears and some minor facial tweaks, but rarely with the yellowish skin/fur.
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Violence good. Sexy bad. Yay America.