Kirajins are the 1st and main enemy in Patafour.
They are designed to kill and destroy everything and anyone in their way, this is their only purpose.
Kirajins want the ultimate destruction of the Patafour/Patapon world.
They were created far before any life appeared in the world, carefully following its development at first.
However, the more the world developed, the more they hated it.
With each new sprinkle of life, the Kirajins wanted to destroy it more.
The farthest ancestors of Patapons lived under their, huge triangular, blood-filled eyes.
This is all according to the Patafour Devlog #4