1. Three nations, one controls gas, one controls solids, one controls liquid. At birth, a person has an innate speed and matter. For example: Pure water and it's viscosity.
Potential: Middle-Top(Depends on author's creativity and knowledge)
2. Empires/Tribes/Organizations fight in an endless desert. The sun is extremely hot and there is an extreme lack of resources. There is a Goddess of Oasis, Temptress of Mirage, and the Sun Devil. They fight in the desert using martial arts using glass, wind, and sand. They use glass from the glass volcano to create conclave and convex glass with molds. They use this glass to create their buildings by heating up sand and oil from palm trees at a rare oasis. There is also a sandy plain where the wind is extremely intense, the inhabitants there use the jet stream and gliders to get around on the sand. They also have martial arts that use the wind. There is also sand mountain where people temper their body by getting closer to the sun and buffeted by ever-increasing wind as they get higher. Example of martial arts: After Image Mirage, which uses glass to intensify the sun around the user to make a mirage around them while they fight, it requires body tempering to withstand the heat though.
Potential: High-Top
3. Gooey Gluey Wars. People fight using different types of glue. Types could include: corrosive, structural, healing, net, heat, cold, and etc. glues. These glues are shot out of a blaster using a chemical reaction. Types of glue will come in glue canisters as ammunition. Some glues can only be found in certain places. Maybe there could even be sentient glue. :)
Potential: High-Top