Geiz has two final forms that are orange and blue respectively, which are complementary colors. Cross-Z is a special case, as his base and power-up forms are dominantly blue, while his final form is the negative of blue, being dominantly orange instead.
#KAMEN RIDER KUUGA ULTIMATE FORM DRIVER#
Garren, Zeronos, Baron, and Birth are the only exceptions as they have a red color scheme, while Mach only has the color blue on his Driver and visor, with his Extra Final Form (Mach Chaser) having more blue instead.