"Powers come in different forms."
Imagine it like the Prime colours/colors, they all branch off into secondary, third, forth. You see the point.
First comes the Common: Water, Fire, Earth (AKA: Solids such as rock)
The most common or secondary: Smoke, Dust, Ice, Heat, Lava/Molten. (Could add more at request)
There are more but they are rarer and only special individuals gain them.
This is a new idea of mine. I introduce OC's with powers. Basically anything that could be used in any form and activated in any way. I'd mostly accept requests and use some of my own OC's but Meh, if it doesn't work then I'll scrap it.