We are the Elemental Guardians...

On a future Earth, humans are at peace. Wars are just legends, and it is a time of celebration. Pollution and Global Warming are both gone. Of course, humans aren't perfect, and that is where the Elemental Guardians come in. Even though they can become invisible to humans, the humans can feel their presence. They are what humans call gaurdian angels, and it is somewhat true. They are Earthly personifications of the angels in Heaven, sent to protect humans from the consequences of their imperfections. But this peace was not meant to last. A Dark force is sweeping the world, and those of Light can feel it. The Elder Guardians are worried, and for good reason. Humans and Guardians alike are succumbing to the Darkness, restoring the world to it's previous state of death and confusion. The apocalypse is coming, headed by the Four Horsemen themselves, and all anyone can do is to train more Elementals for the coming battle...
Note: Elementals have wings and have eyes that match their element. Purple for spirit, red for fire, blue for water, yellow for air, and green for earth.
Darks have red or black eyes, and can look like humans, Elementals, or Anthros.