Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Mario & Luigi: Partners in Time
When a character faints. When an Adult faints, their younger version drags them to safety, and if one of the Babies, the other starts to cry and then carries the other for the rest of the duration of the battle! It brings tears to your eyes.
When Toadbert, Toadiko, and Kylie turn into Shroob Mushrooms.