Counterpart Comparison: Toei themselves invoked this with Kamen Rider Blade during the first Kamen Rider × Super Sentai: Super Hero Taisen, where Captain Marvelous and Kamen Rider Decade each transform into the lead of the corresponding entry from their respective franchise, acknowledging that each member of the team has a corresponding Blade ridernote Spade Ace and Blade; Heart Queen and Chalice; Dia Jack and Garren; Clover King and Leangle, save for Big One, who has no counterpart in Blade's TV series (although if one were to include the Kerberos riders in Missing Ace, it's likely that his counterpart would be Glaive, given his importance in the movie and the World of Diend arc of Decade).
Oddly enough, while the show was airing, he was actually considered something of a Scrappy, due to the fact that he made the series considerably Lighter and Softer, and because he replaced Commander Kujirai. Some even point to him as a principal cause of JAKQ being the only Super Sentai to be canceled. Of course, the reason why he was introduced in the first place was because kids were avoiding JAKQ because it was getting too much Darker and Edgier for them.
Guess who represents JAKQ in both Gaoranger'sandGokaiger's anniversary teamup movie? Not bad for a guy who was originally part of an unpopular Re Tool.
Harsher in Hindsight: JAKQ is funded by an organization called ISSIS. One less "S" and it becomes REALLY uncomfortable.
As noted on the Trivia page, Spade Ace and Dia Jack were originally planned as the Blue and Red Rangers respectively, which would've also resulted in their roles being swapped but had their colors and roles switched in the final product. Take a wild guess what colors the Spade-themed Blade and Diamond-themed Garren from the aforementioned Kamen Rider Blade are.
The series itself. Back in the day, it started as too much Darker and Edgier than Goranger for the kiddies, and then when its tone and direction swerved, it lost what those who did enjoy it liked about it, ultimately pleasing no one and having its episode count slashed; its predecessor went 89 episodes while it went 35. Today? Pre-changes, it's the dark sentai that adult fans love, and post-changes, it's the sentai that has you-know-who.