Ideas on using magic: To climb a vertical wall keep pushing against the wall in a descending diagonal while pulling on an ascending diagonal, the horizontal forces get cancelled and you start ascending parallel to the wall. That is in case you can pull and not only push like Ria did to float above the ground.
I wonder what he is burning when he makes fire out of air...
He could try creating static electricity, and when it dischages with a small arc amplifying it and using it to create lighting.
If he can create pressure in a specific are he could try making a wind tunnel out of magic with a high pressure spot on one end and a low pressure spot on the other. What would happen if he makes magic curculate like a whirlwind?