This is to help my reader understand the story better.

(Might contain spoiler, read at your own risk!)

About magic

Every person is born with different affinity to the elemental magic which is attached to their soul. Depend on their affinity they can use different magic. Like if you only have fire affinity you can only use fire magic, but if you have fire and lightning you can use fire or lightning magic. And anyone can use the magic that doesn't require any element. But it's generally weaker and require a lot more mana.

Ulfur (Demos Arisei Greyer)

Ulfur has affinity to all element. Also Ulfur know that Arendel have no affinity to elemental magic is because Arendel's body (swordsman) have very little mana and almost everyone  who don't have any affinity is like that. The fact that Ulfur can enchant his fist with element is because Ulfur is able to conserve the use of mana to the maximum.(He might not look like it but he is not called a demon king for nothing) Ulfur became a demon king is because he always admire villain, so he just went and become one.

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Arendel (Ducan Wolf)

Arendel is one of the strongest swordsman and is called Gourmet Sword due to her thirst for food. She is a war orphan and is constantly hungry and that is what created her thirst for food. One day, she picked up a sword when she is about to die due to hunger and killed a deer and ate it. After that she keep on improving her swordsmanship and fought for survival. When the king offer her meals forever she readily accept it as she won't ever be hungry again. Also, she got kicked out of the school because she ate all of the animal in the vicinity of the school(include principal's favorite dog). She ate principal's dog right in front of him.(Arendel is a legitimate loli)