Figuarts Beet and Stag Buster
Monsterarts (Heisei) Gamera
Ultra-Act Nexus Anphans
Figuarts Shurikenger
Figuarts Zu-BAT!

Yeeeeeeah.

Bonus generic 6th option is having Bandai Japan rereleasing older DX Sentai Mecha. That'd be cool.

I'd say FiguArts-wise:

1. Kingranger
2. Unarmored Dragonranger
3. Abareddo
4. Abareblack
5. Abarewhite

I was about to post something, but this guy nailed all I ever wanted:

I suppose a fourth and fifth one would be:

4) Soul of Chogokin EngineOh G12
5) Soul of Chogokin MMPR Megazord, cause why not?

Or ignore any of the above and give me this:

I'm gonna go with an all Kiva list:

Saga
Kiva Kiva form
Kiva Garulu Form
Kiva Dogga Form
Kiva Bassha form
Rook Fangire

My wish list is very Power Rangers focused but everything except the Titanium Ranger theoretically could be released in Japan.

1.) SH Figuarts Ecliptor
2.) SH Figuarts Titanium Ranger
3.) SH Figuarts Surikenger
4.) Legacy Astro Megaship/Megazord with additional articulation
5.) Legacy Dino Thunder Megazord base form with additional articulation where possible.

1. Figuarts Malshina
2. Figuarts Kyoryu Violet (both male and female)
3. Legacy Thunder Megazord
4. Legacy White Tigerzord
5. The rest of the Figuarts Dairangers

1. GaoTriple
2. GaoGuardian
3. My OlympusOh ToQger idea
4+5. Deinosgrander and Gurumonite according to my ideas.

1. SHF Rio and Mele
2. SHF Gekirangers*
3. SRC Kakure Daishogun
4. SHF Den-O Wing Form
5. Legacy Zeo Megazord

*I listed the Gekirangers as a whole because I wanted to name more than just them for my list.

If we are talking individual figures
1) SRC Dragon Caesar
2) S.H.F. KingRanger
3) S.H.F. Golems
4) S.H.F. Juspion
5) S.H.F. Megared

The list changes if we are talking teams
1) Chouriki Sentai Ohranger
2) Denji Sentai Megaranger
3) Ninja Sentai Kakuranger
4) Mirai Sentai Timeranger
5) Gekisou Sentai Carranger
all as S.H.F. .