Plucky robot sidekick: Gorisaki or Datas or Bomper or Navi or Daigoyou or Gabutyra... I liked them all

Mentor : Jii

Red: Captain Marvellous (Pirate!)
Blue: Nossan
Green: Don
Black: Ian
Pink: Eiri (She's so happy and cheery!)
Yellow: Moune
Other: Beet J Stag Vs Ulshade... I hate you :( (Beet J Stag)
Sixth: GoseiKnight!
Villian: Basco Ta Jokolia
Individual Mecha: Kyoretsu-Oh
Combined Mecha: Bakuretsu Kyoryuzin, I guess
Upgrade: Miracle Goseiger
Show Theme: VAMOLA! Kyoryuger
Invidual Theme: Beet Buster's theme music of AWESOME!

Red: Daigo (King)
Blue: Joe/Ryuji/Nossan
Green: Souji (Obviously)
Black: Ian
Pink: Amy
Yellow: Luka
Other: Yayoi
Sixth: Utchy
Team: Kyoryuger
Villian: Aigaron
Individual Vehicle: Zakutor
Combined Mech: Kyoryuzin Kung-Fu
Upgrade:
Show Theme: Kyoryuger
Individual Theme:KyoryuGold's

Yeah I love Kyoryuger.

Red: Shiba Takeru.
Yellow: Hanaori Kotoha.
Blue: Ikenami Ryuunosuke.
Green: Souji.
Black: Ian.
Pink: Shiraishi Mako.
Other: Ramirez.
Sixth: Umemori Genta/Beet J. Stag/Utsusemimaru.
Villain: Fuwa Juuzo.
Individual Mech: Pteragordon.
Combined Mecha: Gosei Ground.
Upgrade: Hyper Shinkenger.
Show Theme: "Samurai Sentai Shinkenger."
Individual Theme: "Ikkan Kenjou!"/"Boost Up! Beet Buster!"

Red: Between Takeru Shiba/Shinken Red, Alata/Gosei Red, Captain Marvelous/Gokai Red, Hiromu Sakurada/Red Buster, and Daigo Kiryu/Kyoryu Red
Blue: Joe Gibbken/Gokai Blue
Green: Souji Rippuken/Kyoryu Green
Black: Gunpei Ishihara/Go-on Black
Pink: Amy Yuzuki/Kyoryu Pink
Yellow: Luka Millfy/Gokai Yellow
Other: Gosei Knight, Aka Red, Ramirez/Kyoryu Cyan, Tensai/Kyoryu Grey, and Doctor Ulshade/Kyoryu Violet I and Yayoi Ulshade/Kyoryu Violet II
Sixth: In a team deathmatch situation, Utsusemimaru (AKA Utchy)/Kyoryu Gold and Gai Ikari/Gokai Silver Vs Jin Masato/Beet Buster and Beet J. Stag/Stag Buster.
Team: Tensou Sentai Goseiger, Kaizoku Sentai Gokaiger and Zyuden Sentai Kyoryuger
Villian: Basco and Enter
Individual Vehicle: CB-01 Cheetah/Go-Buster Ace
Combined Mech: Shinken Haoh
Upgrade: Gokai Silver Gold Mode and Kyoryu Red Carnival
Show Theme: Between "Busters Ready Go!" And "VAMOLA! Kyoryuger!"
Individual Theme: "Iza, Kyoryu Gold" and "Hagane no Kokoro, Gokai Silver!"

I'd do one, but considering out of the timeline given I've only seen Gokaiger and a couple Goseiger episodes....yeah...

I've edited a few either to be more specific or to change to something that my answer would be something other than N/A. I bolded what's changed. Mainly added Gold and Silver because those colors are used as much or more often than Green and Black in this era.

Red: Marvelous, Hiromu, and Takeru are 3 of my favorite Reds, so I'm listing them all.
Blue: Ryuuji
Green: Doc
Yellow: Luka, my favorite Milfy :p
Pink: Ahim
Gold: Jin
Silver: Juice Drinker, Silver Stag! Beet J. Stag
Black: Takeshi Kuroki/Black Puma!
Sixth: Gai
Other: Red Princess
Robot Sidekick: Navi
Crossover Ally: Gavan, because everything is better with Kenji Ohba
Team: Gokaiger
Villian: Enter. Best Sentai villain ever.
Individual MotW (Monster of the Week): Eraseroid
Individual Zord/Megazord: Ace
Combined Mech: GokaiOh or ShinkenOh I guess. The combined mechas of this era are really weak.
Upgrade: Powered Custom.
Intro Theme: Busters Ready Go!
Outro Theme: Superhero Getter
Individual Theme: Boost Up! Beet Buster! Samba music done right!

WHAT? No Gekiranger??? ;_; Damn, there goes my all-time favorite villainess, Mele... Ah, anyway ;)

Red: Alata/GoseiRed
Blue: Ryunosuke Ikenami/ ShinkenBlue
Green: Hanto Jou/ Go-On Green
Black: Ian Yorkland/ KyoryuBlack (sorry, Agri x,D)
Pink: Eri/ GoseiPink
Yellow: Luka Millfy/ GokaiYellow (Sorry, Saki...)
Other: Yayoi Ulshade/ KyoryuViolet; Jin Masato/ Beet Buster (love them both so much <3)
Sixth: Gai Ikari/ GokaiSilver
Team: Goseiger
Villian: Escape
Individual Vehicle: Go-Buster Ace
Combined Mech: ShinkenOh
Upgrade: Super Shinkenger
Show Theme: Busters, Ready, Go
Individual Theme: Boost Up! Beet Buster

Black is always a tough choice in these things. But I can't hate Ian :lol (Yea, sorry Agri >_> Forgive me!) I have the feeling I need to watch Go-Buster, though. I have no idea who Escape is.

Escape pops in at about half of the season and is pretty bad-ass. Though she sure has a sad end....