The Miracle Of Useful Gods.
The shape of the elementals in this plane is weird but they are very strong. They are holding themselves very well against the demons. They lack physical prowess but they don't need it. Their energy manipulation is impeccable so their ability to craft spells is outstanding. Each Elemental is a cannon made for bombarding the enemy with spells. They might look chubby but that's only because they are full of power.
It is unfortunate that their enemies are demons. Demons have no weaknesses either physical, magical, or spiritual. Demons can't utilize all of the three but they have defenses and resistance for all three of them. The lack of weakness has helped Demons invade several planes and fight different types of races without a handicap. They are able to keep their strength no matter what type of special race they encounter. The elementals of this plane are just another race that might fall to the onslaught of the abyss.