Azalynn's base design is borrowed from a character in an anime series I haven't seen (Kaolla Suu in Love Hina), but she isn't an exact visual match, and you're right, she does have an unusual coloration. Depending on the lighting conditions, Azalynn's skin tone can look like anything from unpolished, oxidized copper (that dull brown color, not green - verdigris is copper carbonate, not copper oxide) to a deep bronze. It's normally close enough to the typical color of someone from one of the Water Tribes that no one takes special notice, though - particularly in the United Republic, where people with roots all over Dìqiú are common.

Under particularly dramatic lighting conditions, her skin does have a kind of luster to it that isn't customarily found in human skin. That effect is normally much more noticeable in her eyes, though, which look distinctly metallic even under ordinary daylight and are reflective in the dark in a way that human eyes are not. It's mentioned a couple of times that under the bright stage lighting the Art of Noise use for their biggest shows, she seems to be made almost entirely of metal - gold eyes, silver hair, bronze/copper body. That effect is much less vivid in normal light, though.

So it's not a perfect disguise, and she's certainly going to be considered memorably exotic by most of her "schoolmates" during her undercover period, but if she hides her tail well enough and you don't notice that she doesn't have pinkies, she doesn't actually look blatantly alien. Just... interesting.

(Keep in mind, also, that with the Spirit World having been open for more than a century by this point, spirits and spirit-human hybrids walking the mortal world are... not common, but numerous enough not to be particularly surprising. So most of the girls at Sato Academy who notice anything unusual about her probably assume she's one of those. That's the real reason Ritsu didn't remark on her unusual appearance, not because she didn't notice it. She just didn't think it was worth badgermoling her new friend about.)

--G.
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