[Sunred]

1. Goranger
- Started the whole gig
- First to have a two-year run

2. JAKQ
- First to have a white member
- First to have a VS team up with their predecessor, and on the theaters at that (Go-onger was never the first)

3. Battle Fever J
- FIRST TEAM TO HAVE A HUMANOID ROBOT

4. Denjiman
- First to have a henshin device
- First to have a ring as a henshin device
- First to have a transforming robot

5. Sunvulcan
- First all-male sentai
- First to use a bracelet device
- First to have a combining robot
- First animal-themed sentai

6. Goggle V
- First to have Red Blue Black Yellow Pink

7. Dynaman
- First to wear spandex

8. Bioman
- First to have two ladies
- First yellow female warrior

9. Changeman
- First to have individual weapons assemble into a bazooka
- First sentai to have no yellow
- First to have uniforms during civilian form
- First mythical beast-themed sentai

10. Flashman
- First to have two robots

11. Maskman
- First to have individual mecha units
- Though not official, started the concept of a sixth ranger
- First show that had all members already utilize their henshin abilities
- First to have two bazookas

12. Liveman
- First to have two robots combine
- First to have green and black together
- FIRST BLUE HEROINE
- First to use a two-piece bracelet device

13. Turboranger
- First car-themed sentai
- First all-teen sentai
- First to have 3 robots combine into one

14. Fiveman
- First family sentai
- First to have a power-up
- First to have gender-based henshin devices (bracelets for boys, compacts for girls)
- First to have the lackey robot be a weapon

15. Jetman
- First to have Red Blue Yellow Black White
- First to have azure as blue

16. Zyuranger
- MMPR
- First fantasy sentai
- First dinosaur-themed sentai
- First official sixth ranger
- First to have a belt buckle as a henshin device

17. Dairanger
- First Chinese-themed sentai
- First to have a child member
- First white sixth ranger

18. Kakuranger
- First ninja sentai
- First to have a non-ranger sixth member
- First to have a female leader
(Because Ninjared was the hypeman and protagonist, Tsuruhime was technically the leader dispite her age.)
- First to utilize an inrou as a henshin device

19. Ohranger
- First to have a black sixth ranger
- First to have a VS on V Cinema

20. Carranger
- First full-fledged comedy sentai
- First sentai to accidentally send their new bazooka to a customer from way back and driving a long distance to get it back

21. Megaranger
- First to have a silver sixth ranger (who also had a crack at politics few years ago)
- First to introduce a cellphone as a henshin device(Megasilver only)

22. Gingaman
- First to have a power-up for a robot

23. GogoV
- First to have a train for one of the robots
- First to have a full visor helmet

24. Timeranger
- First to have a red sixth ranger
- Last sentai of the 20th century
- First to have an alien member

25. Gaoranger
- First sentai of the 21st century
- First to have multiple auxiliary mechas
- First to have a VS team up with a "dream team"

26. Hurricanger
- First to have two teams of sentai
- First sixth ranger with no fixed civilian form
- First to have a full-length reunion special
- First to have insect motifs

27. Abaranger
- First to have song and dance in ending
- First to have a family man as a member

28. Dekaranger
- First police sentai
- First to have a gold warrior
- First to have a grey warrior
- First to utilize notepads as henshin device

29. Magiranger
- First magic-themed sentai
- First Goranger-colored sentai to have a female blue
- First to have red as the youngest

30. Boukenger
- First to have multiple villain factions

31. Gekiranger
- First to drop the belt
- First official violet warrior
- First to have a bearded member

32. Go-onger
- First seven-member team
- First to have gold and silver together

33. Shinkenger
- First samurai sentai
- First to use the Red One cam for filming
- First to have on-location audio recording
- First to have a female red
- First to have mecha and a henshin device modeled after seafood
- First to integrate kanji for helmet

34. Goseiger
- First to have a fully mechanized sixth ranger
- First to have a snake motif
- First to have the lackey robot be a fully-fledged combat mecha

35. Gokaiger
- First pirate sentai
- First team to have initial roster consist of aliens
- First to have a super sentai fanboy amongst the ranks

36. Go-busters
- First to use outdoor miniature sets for mecha battles
- First to use synthetic leather/enamel textiles for suit

37. Kyoryuger
- First to have an official 10-member team in the end
- First to have Cyan
- First to have a member with an awesome afro

38. ToQger
- First fully train-themed sentai
- First to have an orange sixth member
- First to have neon green as green
- First to utilize a smartphone as a henshin device

Bottom line, they are all important in some way or another.