The friendship scene, where Alice declares that Oz, Gil, and Break are all part of her Nakama. Gil and Oz precede to pull Break into a wonderfully awkward bro-hug.
Retrace XXXIII: Echo of Noise has Oz celebrating a festival with Echo.
Pretty much the entirety of the Unbirthday chapter, but special mention goes to:
Elliot finally admitting defeat and acknowledging Oz as a friend.
Oz spots Echo and pulls her into the party.
Oscar calls Oz his son, and the whole thing with the camera
Oscar finally meets up with Oz and Gil after ten years of separation. His reaction? BEAR HUG.
Retrace XXIV: Oz and Ada meeting after ten years of separation.
Retrace XLIII, when Reim starts on Break's reports because Break is almost completely blind now, Break nods and says it's Reim's job as an adviser to the house, at which Reim gets angry and yells at him that it's not that, it's because he's his friend.
When Sharon is trying to teach Break to dance with her at Oz's second ceremony, he finally admits to her that he's gone almost completely blind. Her reaction? She smiles, offers her hand, and say's she'll just have to teach him one step at a time.
Elliot's bitchslap exchange and bonding session with his sister Vanessa... right before she's beheaded in front of him, possibly by his own doing.
In Retrace 55, Gil pulling a Big Damn Heroes in Break's fight and introducing himself as "that idiot's left eye", talking about Break. For the two of them, that's really effing heartwarming.
The whole of the retrace Lily and Reim. Except for when Reim shoots Lily in the head.
From Retrace 61: Learning that Vincent really loved Elliot all along, and comforted him in his final moments, and killed Duke Nightray because he didn't care about his son's life. Then his admission of his true goal, which is to erase himself from existence to make Gil happier.
Also from Retrace 61: Elliot's last words were "I'm sorry, Leo."
And in chapter 50 Elliot and Leo get into a fight and Elliot has a flashback where he remembers when he chose Leo to be his servant. "I think my servant should be someone as irritating as you. You are what I've always been looking for. Someone I can speak to openly. My friend and equal." He then gives a warm smile and offers his hand to Leo.
"Elliot was always noble-minded and unyielding. That is probably why... someone like me, who was your exact opposite accepted your offer, to be by your side." Said by a Face Heel Turned Leo in Retrace 63, in which by that time, Elliot's alreadykicked the bucket.
In Retrace 67, Jack's face when he sees Lacie again after 8 years of searching is simply adorable.
In Retrace 68, Young Gil telling a Young Vincent "Don't worry. No matter what happens I'll always be there to protect you."