Heartwarming / The Return of Princess Nightmare Moon
Nightmare Moon and Bandaid's time together in part 2 of A Carnival, Bandaid! in the sequel is very loving and heartfelt. Especially when you remember that Nightmare Moon is usually loud and boisterous and Bandaid is very uncomfortable with mares.
Celestia's attempts to reconcile with Chrysalis as well as her attempts to mend the broken bond between the latter and Nightmare Moon in the sequel. As turbulent as her relationships with her siblings are, Celestia just wants her family to get along.
Faust's interaction with both Celestia and Chrysalis in the chapter Faust Almighty, Bandaid! in the sequel is very heartwarming.