[FairyKing]

It also matches Wizard's four styles, and you could match Buster to Beast with his black-and-gold colors. The five of them also match the colors of OOO's normal combos, plus Calibur as PuToTyra. There's obvious parallels to other Kamen Rider color arrangements too, though none of them match quite so exactly.

Wow, it's almost like giving each suit a different primary color is a popular trope in Kamen Rider! Maybe because it makes it easy to tell which is which when they still have a similar aesthetic otherwise?