As an American of primarily Italian descent, I can confirm that Italians don't tan easily.
...Mostly because we're already very tan to begin with.
There are many italians with fair complexion. Blonde hair and green eyes = doesn't tan easily. Libeccio belongs to the other category. Bown hair and eyes = tan easily.
Maybe she's from the Tirol, they're practically German--
(looks at Ro-chan)
--oh.
She had been laid down at the Muggiano Shipyard, so she is from Liguria. BTW, is the same shipyard that built Zara.
It's funny to think that all of her bigger sisters in game never left Mediterranean (apart from Aquila, in her previous life), while little Lui sailed the big oceans alone.