Dukemon22 may not remember this but he once told me that the reason that most of the Sixth Rangers were silver or gold or metallic colors was for Toei to show off something shiny to sell toys. Come to think about it in a business standpoint, if kids bought the new Sentai toys in February, there would be a lull in May or the summer, so they put something new to get them buying more toys. Here are the shiniest of the Sixth Rangers. The only ones I don't cover here are Time Fire/Quantum Ranger, Abare Killer/White Dino Ranger and Deka Break/Omega Ranger.
Dragon Ranger / Green RangerHe was green, not that shiny but he had a big shiny gold shield, which is very memorable to fans.
Kiba Ranger / White RangerHe was white but sure had a lot of gold, the shield, the belt, helmet, cuffs and even his sabre.
King Ranger/Gold RangerCome on, we mostly remember him as the 'Gold Ranger' because of all the gold he wore. Toei counts him as a Black Ranger as his name was not 'Gold' in Sentai.
Mega Silver/Silver RangerHe was the first fully metallic Ranger in Sentai, he was the first and not last of the Silver Rangers.
Titanium RangerBandai America/Saban chose to make their own Ranger without Super Sentai counterpart, they could had chosen any color they wanted (that wasn't the main 5) so it could had been White, Black, Purple, whatever, but they chose Silver-y Titanium. This could support the theory that shiny metallics are the way to go for Sixth Rangers, the majority of them are metallics.
Gao Silver/Lunar Wolf Ranger
Second Silver Ranger in Sentai, he had some dark blue/indigo in his suit but with gold.
Shurikenger/Green Samurai Ranger
He was Green but he definitely had more gold than Dragon Ranger.
Deka Master/Shadow Ranger
Even though he had Black and blue-ish armor, the blue-ish armor was shiny. He's an Extra Hero but there was a lot of toys made of him and he sure is shiny and some people do count him as Sixth.
Magi Shine/Solaris Knight
The shiniest of them all, he had a blue suit but you could barely see it with its gold armor.
Bouken Silver/Mercury Ranger
He was shiny even though he had black, even his blue accents were metallic and shiny.
Go-On Gold and Go-On Silver/Ranger Gold and Ranger Silver
I remember a cousin said they looked like Duracell batteries, because they were shiny.
Shinken Gold/Gold Ranger
Blue was a welcoming change to counterbalance the gold, instead of black. Because now seeing the Gold Mega Ranger in Samurai with black, the black made him look duller than with the blue.
GoseiKnight
Pretty shiny, we regarded him as a gold-silver-black Extra Hero but he is considered as a Silver Ranger in Sentai.
GokaiSilver
He coined the phrase 'Let's Get Shiny' for Super Sentai. The 10th truly shiny Sixth Ranger and the seventh Silver Ranger (including DekaBright).
Titanium Ranger
Gao Silver/Lunar Wolf RangerSecond Silver Ranger in Sentai, he had some dark blue/indigo in his suit but with gold.
Shurikenger/Green Samurai RangerHe was Green but he definitely had more gold than Dragon Ranger.
Deka Master/Shadow RangerEven though he had Black and blue-ish armor, the blue-ish armor was shiny. He's an Extra Hero but there was a lot of toys made of him and he sure is shiny and some people do count him as Sixth.
Magi Shine/Solaris KnightThe shiniest of them all, he had a blue suit but you could barely see it with its gold armor.
Bouken Silver/Mercury RangerHe was shiny even though he had black, even his blue accents were metallic and shiny.
Go-On Gold and Go-On Silver/Ranger Gold and Ranger SilverI remember a cousin said they looked like Duracell batteries, because they were shiny.
Shinken Gold/Gold RangerBlue was a welcoming change to counterbalance the gold, instead of black. Because now seeing the Gold Mega Ranger in Samurai with black, the black made him look duller than with the blue.
GoseiKnightPretty shiny, we regarded him as a gold-silver-black Extra Hero but he is considered as a Silver Ranger in Sentai.
GokaiSilverHe coined the phrase 'Let's Get Shiny' for Super Sentai. The 10th truly shiny Sixth Ranger and the seventh Silver Ranger (including DekaBright).
She was a mother, obviously but I don't know, just a mother? She was a warrior, not just a mother.