King Gorn of Saronia has gone completely nuts, forcing his army to fight themselves among other things including banishing his son Prince Alus. When the party brings the prince back to the castle to talk some sense into the king, they are invited to sleep and talk in the morning. The king tries to stab him in his sleep, but breaks free of Gigameth's mind control just long enough to stab himself. He was not about to let his son die.
Anytime Zidane says "Do I need a reason to help someone?"
During a cutscene, Onion Knight points out the fact that the Warrior of Light hasn't lost his composure. Despite the fact that Cosmos was killed right before his eye's. Onion thinks Warrior is being callous. Cecil points out that the Warrior is just trying to do what Cosmos would have wanted him to do. This makes Onion reconsider his negative opinon.
After Cecil gets his crystal, he tells Golbez "We obtained this together." Awwwww!
In Duodecim, the Warrior of Light feels as if he doesn't diserve to be Cosmos's chosen anymore. What with stabing his friends in the back, LITERALY! The look on Cosmos face when he says he's sorry, and that he's about to commit a Heroic Sacrifice says a lot. Considering the fact that she knows the war isn't supposed to "bring balance back to the force" at all.
From Duodecim, all of Warrior of the Light and Prishe moments that aren't crowning moments of funny.