Ninpuu Sentai Hurricaneger (2002)

It's the 25th sequel of the series from Super Sentai right after Hyakujuu Sentai Gaoranger which is the 24th sequel. If you would like to watch the super sentai series chronologically.

It's the 26th sequel of the series from Super Sentai right after Ninpuu Sentai Hurricaneger which is the 25th sequel. If you would like to watch the super sentai series chronologically.

Kougaiger is a show meant to parody Toei's Super Sentai. So naturally, any sentai would be a good recommendation. However, direct inspiration can be seen to have been taken from Toei's Ninpuu Sentai Hurricanegerr. The suits are heavily inspired by Hurricaneger with the motif being Ninjas, a motif that Toei has used multiply times in Sentai.

Both are Super Sentai series
Both are Ninja themed
Both have their ninja rangers start off as students that still have a lot to learn
It had two members show up in it

Both are Ninja theme seasons with hints of both dark and comedy elements
Both have only a sole female member
Both are from the Super Sentai franchise owned by toei
Both had made a crossover to Ninninger

Both start with 3(Male Red and Yellow and Female Blue)
Both of the 3 were survivors of an attack at their school
Both villains are galactic themed
2 rangers join the team
The 3 rangers theme are (Falcon, Lion and Dolphin)

It's the very first Super Sentai series what made many of it's successors possible. If you want to watch the original first season of the Super Sentai series.