Have magic be limited. For example, I am writing a story where everybody has fire, water, earth, or air powers, but for example my main character can control which water goes where but her friend can make water, but that means that if they touch fire, instead of getting burned, they evaporate a little.

Write a book.

I have a question that might seem super weird. I don't want any advice, I just want to know: What does having a crush on someone feel like? I will post the reason I'm asking next time.