#28 the Dryer Jigen discovers he'd rather be a good person. And he succeeds, despite being in a very dark Sentai series. The moment at the end where he sends a postcard telling the Jetmen he became a hairdresser's apprentice is pure "Awwwww...".
This may be also be on the Gokaiger page, but since it's Gai, it counts here - Gai POWERING HIMSELF BACK FROM THE DEAD to protect his teammates from Kiaido and the Gokaigers.
Ryuu just discovered that Maria is actually Rie and utterly went off the bonkers, now delusional that Rie is always near him and neglects his duty as the leader of Jetman. Then there came Gai, just fresh after quitting the team due to Ryuu's uptightness and epically chews him out and tells him that no matter what everyone else said, Ryuu is always going to be the leader of Jetman... then immediately rejoins the Jetman with Kaori, then led the rest of the Jetman against the Vyram for awhile, until Ryuu came back and stopped being delusional. Yeah, way to go, Gai.