Each of the Magic Knights have a Happybrace that makes them undergo the Happy Making Transformation to turn into Battle Lovers. Each of the Magic Knights have a different colour which also corresponds to each element, therefore:

Happybraces Meaning
Kyotaro Shuzenji Happybrace
Kyotaro's Happybrace is Red and corresponds to Flowers.
Ryoma Kirishima Happybrace
Ryoma's Happybrace is Orange and corresponds to the Stars.
Nanao Wakura Happybrace
Nanao's Happybrace is Green and corresponds to the Moon.
Taishi Manza Happybrace
Taishi's Happybrace is Blue and corresponds to Snow.
Ichiro Dogo Happybrace
Ichiro's Happybrace is Pink and corresponds to Space.