The 7 OOO's

Desire is the strongest weapon there is, or so was the belief of an ancient King.  He had his alchemists create a power to harness desire, becoming the first Kamen Rider OOO, the Multi-King.  But his body couldn't contain the power, and it destroyed him.  The alchemists took the belt for his successor, but he didn't want to see himself destroyed.  Instead he wanted to carve out a better kingdom for his successors; his six children.

His alchemists split the belt into seven, when he only desired six.  He was given one of the belts for his own uses along with his heirs.  He used the power of the Purple Cores while his children used the other six powers.

However, it didn't take long before war broke out in the royal family.  Each side had an army at their disposal, and each allied with a beast known as a Greeed, which gave OOO the power it used.  The seven waged war until no side was left standing.  The seven belts, the Medals, and the Greeed were sealed by the alchemists, who were then put to death.

In present day the seven belts and the seven Greeed have been awoken once more, and are now seeking new owners to control their powers and wage the war to be complete once more.  The Greeed seek to have their OOO destroy every other OOO and Greeed and gain complete power as the Multi-King.

Red - Grey
Blue - Crim
Green - Rei
Yellow
Grey
Purple - Quetz
Orange - Skye

Ankh - Umi
Mezool - Grey
Uva - Crim
Kazari - Quetz
Gamel
Giru - Sohn
Ray - Skye