Bioman: I'd like them to mention Mika more often after her death.
Turboranger: Have Haruna be the one to kill Jarmin. Don't have the three villains die half way through. And to have a better explanation on Lagorn's resurrection.
Fiveman: Finale felt a bit rushed and not as epic as it could've been.
Jetman: Make a movie based off of the manga.

Zyuranger: Give it some more character development, and focus less on the child-of-the-week.
Dairanger: Give it a sequel with the new generation of Dairangers and Gorma.
Kakuranger: Give each character a story-arc, like Dairanger. Instead of just Tsuruhime.
Ohranger: Get rid of episodes 11 and 12. And introduce Multiwa and Kaizer Buldont sooner.
Gaoranger: Add in some story-arcs for the characters.
Abaranger: Give the Bakuryuu some more screen time. Like the ep where Kera turns into a human.
Gekiranger: I would kill for a sequel! And I'd like to know more about who Long is. I thought he was awesome.
Go-onger: Make the Engines the main characters. (yeah. I liked them way more than the Go-ongers themselves. :sweat: )
KR Black RX: Make it a proper sequel to Black.
Faiz: Have at least one ep where the characters can actually enjoy some fun together. As for the finale, I personally thought the finale perfectly wrapped everything up for the series. I would just alter it a bit to make it feel more epic.