I gotta say that Mebius ending pretty much proves why Ultraman has endured all these years; it is a simple concept, but the themes of hope, teamwork and faith in the future are timeless. So yeah, it´s a tear jerker.
I know a lot of people don´t like Go-Onger, but that is one ending that really got to me. Say what you want about the show, the characters were fun and they grew on me, so at the end it was really hard to say goodbye.
That sums up the endings of most sentai, but the ending of Shinkenger was outstanding in these regard; seeing everyone part one by one until only Takeru remained was quite bittersweet. Even Ryounuusuke´s Dance got to me, it was silly yes, but it was silly in a Ryounuusuke kind of way and this was his very own way to say goodbye.
And finally the Black Ending.
This one doesn´t get as much love, but i always found it to be incredibly bittersweet; on the one side, Kotaro saved the world and peace reigned, but he lost all his family in the process, so even though he was free from all the fighting, it was no happy ending for him.
Still, he did what every Rider does; he carried his rage and his sadness and rode into the sunset, until the world needed him again.