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Remember Naruto every character has a personality that is tied with his element. Apparently Naruto's element is wind that makes him extroverted and impulsive. While Sasuke is lightning and darkness that makes him calculated fast and cunning. Imagine yourself in the mind of the developer of a new videogame or anime.
Obviously if it's fantasy you're gonna have to use some kind of attributes to attach to your faction or characters. I would argue that the Necromancers from Iksar are the Blood element as you can see. The Barbarians are snow or ice. It is entirely up to debate what personality you get but you could say that fire people are intense and impulsive while ice people are cold and slow to anger, or something like that. Earth people are grounded and down to earth. Water people are easy going and calm. See? It works and it does make sense!
I don't know the personalities for each element but I put some elements into the poll and you can choose freely. You can even describe the personality behind the element. Maybe it fits you. Personally I like darkness the most.