[TokuChris]

Zyuranger has a special place in the hearts of all Sentai fans because it really did begin the whole idea of a 6th member of the team showing up later. What started in Zyuranger continued in:

Dairanger
OhRanger
Megaranger
Timeranger
Gaoranger
Hurricanger

Once Dekaranger aired, it increased the possibility of extra team members joining.

Dekaranger (like 9 or 10)
Magiranger (8)
Go-Onger (7)
Shinkenger (6 and an extra Red)
Kyoryuger (15 total different actors taking roles of Rangers)

Crazy that trend started with Zyuranger.