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So I thought we knew everything about elements but I found this when playing with the hyper arts damage. It also applies to magic damage.

Elemental Damage (Art/Magic)

Anything not listed means normal damage.
Every element against it's own element does 15/16 damage.

Earth does +6.25% to Wind
Water does +6.25% to Fire
Fire does +6.25% to Water
Wind does +6.25% to Earth
Lightning does + 3.125% to Earth,Water,Fire, Wind
Lightning does - 3.125% to Darkness
Light does + 3.125% to Dark
Dark does + 3.125% to Light

None/Normal does equal damage to all and receives equal damage from all elements.

So lightning is a little odd in that it gets more boosts to other elements but a smaller amount than the normal opposed elements. It also does not have a weakness like the other elements.

Found the Elemental damage chart for the characters and their elemental affinities.

Magic Elemental Damage

Vahn
Earth - 95%
Water - 40%
Fire - 100%
Wind - 70%
Lightning - 70%
Light - 85%
Dark - 85%
Non - 80%

Noa
Earth - 40%
Water - 95%
Fire - 70%
Wind - 100%
Lightning - 70%
Light - 85%
Dark - 85%
Non - 80%

Gala
Earth - 85%
Water - 85%
Fire - 85%
Wind - 85%
Lightning - 100%
Light - 95%
Dark - 60%
Non - 80%

Non Elemental presumably means Juggernaut magic?

So, all three characters are equally proficient in using Juggs?

Non-element is basically all non-seru enemies. I was going to say Juggy is Dark but I went and checked it before posting and you're right, it counts as 07-Non-Elemental damage.

It also appears from my testing and speculation that Cort 2 is also nonelemental. Can you confirm this?

You are right, Cort in the Absolute Fortress is Dark elemental, but Cort 2 is Non-elemental.