It looks like they went all out for the Gokaiger Christmas Special. Besides having a spot-light on GokaiYellow (they did a whole line-up of Yellow Legendary Powers) - but GokaiSilver used his power of imagination to merge GokaiRed and GokaiGreen's powers into a single Red and Green outfit! Add onto that the appearance of Battle Kenya, from Battle Fever J, and this seemed like quite the jam-packed episode.
BTW, Ohba Kenji 大葉 健二, who played Denzi Blue, returns to reprise his original role as Battle Kenya. I never knew he played both roles - so that's quite cool for him to appear in the episode, even it only for the reveal at the end of him dressed up as Santa.
You can find these images added here: Battle Kenya Profile
You can find these images added here: GokaiSilver Profile
You can find this image added here: GokaiYellow Profile
You can find these images added here: GokaiRed Profile
Gokaiger Group Images
You can find these images added here: Gokaiger Group Images
Previous Sentai Powers
You can find these images added here: Previous Sentai Powers