(Spoiler) Why Lyse have so bright skin ?

[RenewalXVII]

There are pale Ala Mhigans, like Fordola for instance.

There's also nothing indicating Curtis was genetically dark skinned; he might have a severe tan. And at the very least, we know nothing about Lyse's mother, who might have been similarly pale; even if Curtis was dark-skinned genetically, it's still fully possible to pass on pale-skinned and blonde genes since they're recessive.

As for Gaius, it's rather reductive to say that just because Garlemald is in the north, all Garleans must be pale. We know that the Garleans were driven north, not that they're native to present day Garlemald; it's possible that there are plenty of dark skinned Garleans from when they still lived in the south of Ilsabard.

[Kenarashi]

There are pale Ala Mhigans, like Fordola for instance.

There's also nothing indicating Curtis was genetically dark skinned; he might have a severe tan. And at the very least, we know nothing about Lyse's mother, who might have been similarly pale; even if Curtis was dark-skinned genetically, it's still fully possible to pass on pale-skinned and blonde genes since they're recessive.

As for Gaius, it's rather reductive to say that just because Garlemald is in the north, all Garleans must be pale. We know that the Garleans were driven north, not that they're native to present day Garlemald; it's possible that there are plenty of dark skinned Garleans from when they still lived in the south of Ilsabard.

That what i understood from the story that they were drived in the past to the north and they sit there for a long time until they discovered magitek technology. After long time in snowy, frozen climat you should be bright skin and blond hair like Zenos. Fordola skin isn't white, she is tan. When playing through heavensward i haven't found any dark skined ishgardian so i kinda hard for me to imagine that ala amigo is so hot and lyse have very white skin.

[RenewalXVII]

That what i understood from the story that they were drived in the past to the north and they sit there for a long time until they discovered magitek technology. After long time in snowy, frozen climat you should be bright skin and blond hair like Zenos. Fordola skin isn't white, she is tan. When playing through heavensward i haven't found any dark skined ishgardian so i kinda hard for me to imagine that ala amigo is so hot and lyse have very white skin.

The Garleans came north only a few centuries ago. That's nowhere near enough time to develop significant genetic differences like that from climate alone, especially in a modernized civilization where there's much less selection pressure.

[Iscah]

It's quite possible Lyse wasn't originally planned to be Ala Mhigan, and her character design was already locked in at the point they decided to change that.

She's also spent a long time away from the country - first in Sharlayan, then mostly in Gridania.

Also, Minfilia is Ala Mhigan as well, and she's not quite as pale as Lyse but she's not dark either.

When playing through heavensward i haven't found any dark skined ishgardian so i kinda hard for me to imagine that ala amigo is so hot and lyse have very white skin.

Look again. From the MSQ we meet Grinnaux and Charibert, and it also seems to be a family trait of House Durendaire, most prominently Jannequinard from the AST quests. (Also their ancestor in our Echo-vision of Haldrath's knights, so it's not something recent.)