I thought it'd be interesting to do another 'all sentai pic' with just our official sixth rangers. And it can be somewhat debatable who classifies as a sixth, but for the most part, I've gone with who was included on Gokai Silver's changer/Gold Mode armor, and then made my best guess for post-Gokaiger.
Dragon Ranger from Kyoryu entai Zyuranger
King Ranger from Chouriki Sentai Ohranger
Kiba Ranger from Gosei Sentai Dairanger
Time Fire from Mirai Sentai Timeranger
Shurikenger from Ninpuu Sentai Hurricaneger
Abare Killer from Bakuryuu Sentai Abaranger
Gao Silver from Hyakujuu Sentai Gaoranger
Mega Silver from Denji Sentai Megaranger
Deka Break from Tokusou Sentai Dekaranger
Bouken Silver from GoGo Sentai Boukenger
Shinken Gold from Samurai Sentai Shinkenger
Go-On Gold from Enjin Sentai Go-Onger
Go-On Silver from Enjin Sentai Go-Onger
Magi Shine from Mahou Sentai Magiranger
Stag Buster from Tokumei Sentai Go-Busters
Beet Buster from Tokumei Sentai Go-Busters
Toq 6/Rokugou from Ressha Sentai Toqger
Starninger from Shuriken Sentai Ninninger
Kyoryu Gold from Zyuden Sentai Kyoryuger
Gokai Silver from Kaizoku Sentai Gokaiger
Gosei Knight from Tensou Sentai Goseiger
When they're all put together like this, you can really see how popular the metallic gold/silver colors are for sixth rangers. And it makes it all the better that Toq 6 was orange.
Like I said, most of these are directly taken from the changer/shield from Gokai Silver. That seems to be, to this date, the most official account of sixths. So yea, a couple series which have sixth-like characters (or who I would've categorized as a sixth) get excluded. And as this is Sentai-only, a couple PR characters who may be "sixths" get excluded as well.
Now for post-Gokaiger, I went with the best guest. Beet and Stag Busters are actual members four and five, but serve the same sixth-ranger dual role as Go-On Gold and Silver; I figured that since both from Go-Onger get counted for sixths, so too would the two from Go-Busters. Kyoryu Gold is the sixth ranger in his series, despite being around much earlier than other sixths. Toq 6 is pretty obvious too. As is Starninger. If/when Toei comes out with a different account of official sixths, I'll change it up. I'll also update the picture as we go forward with new series and characters.
Everything here is my hard work. Please don't touch anything without permission. Thanks.