Mighty (Red) is sorta balanced, Titan (Purple) is the strong, heavily-armored one, Dragon (Blue) is the fastest and jumps the highest, and Pegasus (Green) has heightened senses.
I think after the first four there's a bunch of Kuuga episodes that really could have benefitted if they had been one episode (I still think some Kuuga plots could have easily been in an hour-long or 45-minute-long show.)
Like #9 & 10, for instance. I don't mind putting a lot of emphasis on plot and character development, but when the fight of the episode is basically [HIDE]Kuuga elbowing a guy in slow-motion,[/HIDE] I think they need to remember that they had amazing character/plot development in the first four, and still plenty of time for some really good action. The final fight in #2? One of my favorite fights in any Rider series, ever.