Ok so this is basically what the title implies. If you've seen Avatar: The Last Airbender or Legend of Korea then you kinda get it. Anyway, this is a list based on what I think what element they control would be.

Caine Soren: Fire because on of the challenges of fire is being egotistical and one of its strengths is confidence.

Sam Temple: Air because he's fun - loving and active, but he's also careless

Drake Merwin: Fire because he's assertive but impatient and stubborn

Diana Ladris: Fire - she's resourceful but manipulative and calculating

Astrid Ellison: Earth as she is diplomatic, but stubborn with a habit of being indifferent

Albert Hillsborough: Earth because he's diplomatic, materialistic, and a little emotionless

Brianna: Air and fire because she fun-loving, bold, and careless like air but she's very passionate and impatient like fire

Penny: Water because she's sensitive but also judgmental and unrealistic (I think of her as more of polluted water)

Dahra Baidoo: Water because she's devoted to the care of others and judgemental (to herself)

Edilio Escobar: Earth because he's a hardworking, trustworthy, diplomatic, self-controlled, hoping for the best/preparing for the worst kind of person. But he can be stubborn.

Dekka Talent: Earth because she's self-controlled and trustworthy but she can be pessimistic and indifferent.

Lana Lazar: Fire because she is strong-willed, outspoken, and resourceful but can be selfish and impatient.