Look up any clip from the Teen Titans Go panel at the 2013 San Diego Comic Con. Even after all these years, the voice actors are still the best of buds. Especially Greg and Tara.
In "Driver's Ed", the first thing Robin does after getting in a serious Batmobile wreck is to call Batman, who apparently offered to get down there right that minute to pick him up. It's kind of sweet how typically "father-son" that whole exchange is.
In "Dog Hand" when Raven is in a bad mood, while she doesn't answer when Beast Boy asks, and even lashes out in her demonic form when Cyborg pushes her on the matter; it is ultimately Robin that snaps her out of it and gets her to spill the beans on her Daddy Issues. It's even more heartwarming to the people that wrote the show because even though it was a semi-comedic approach to it, the writers knew of Raven's bond with Robin would stick in one episode at least.
Cyborg and Beast Boy making up after their pie fight.
Cyborg: Why were we ever fighting?
Beast Boy: I love pie.
Cyborg: I love you and pie.
Even though they pranked Beast Boy into thinking he was a ghost, the Titans were willing to stop him from Jumping into a Volcano. At the cost of their lives no less.
"Hey Pizza" begins with Beast Boy and Silkie trying to stay cool. It's hard not to say "awww" when they bump fists while relaxing in an inflatable pool.
Robin sacrificing the pool, and a chance at seeing Starfire in an itsy-bitsy teeny-weeny yellow polkadot bikini, to build a senior center for the elderly.
Beast Boy and Starfire's relationship in "Starliar" is this for some viewers. Especially since this series tends to make all the Titans act like jerks, here they act much more like how they did in the first series.
The episode can best be described as adorable due to the fact they're both having genuine fun, up until Beast Boy realizes he's let things get out of hand, and even then it's still rather cute.
The ending comes off as a big sister playfully teasing a younger brother.
Starfire's lies cause Robin, Cyborg, and Raven to turn on each other. When it gets out of hand, Starfire comes clean and feels like leaving the Titans over what she's done. The Titans (especially Robin) forgive her and each other and clean up the mess they made. Beast Boy even comments on how heartfelt that was.
It's pretty heartwarming that Raven can express her cracked tooth problem to her friends....except Beast Boy. Her eyes when she nods at their questions show that she is genuinely frightened, but can't say why. It of course turns into a moment of Funny when Beast Boy breaks her silence. Even Cyborg, who's the reason her tooth is cracked in the first place didn't get it as rough.
In the same episode, Cyborg gives Beast Boy "tofu meatballs" since the latter is a vegetarian. Since the two often argued about meat vs. tofu in the original series, it's nice to see Cyborg respect Beast Boy's vegetarianism.
In Terra-ized Raven hinting at the end that she may have feelings for Beast Boy. Pretty heartwarming for both the Titans and their fans.
Also, a blink-and-you'll-miss-it moment, but Robin keeps a picture of Batman carrying him on his shoulders next to his bed. Awwwwww.
The reveal that Cyborg enjoys eating veggie burgers.
The end episode has Raven and Starfire staying by Light's side and waiting for help to arrive.
PEACE AND LOVE, PEACE AND LOVE
Considering all the faults in Beast Boy that Raven pointed out in "Matched", comforting Beast Boy after revealing Terra's true nature and telling him he's fine just the way he is speaks volumes. Turns into something of a Tear Jerker near the end of the conversation:
Beast Boy: (Heartbroken after seeing that Terra undeniably hates him) What's wrong with meeeee?!
Raven: There's nothing wrong with you...it's her, she's an awful person."
Beast Boy: No! There's a good side to her, Rave, I know it...I'm just not good enough for her.
Although it sucks for Raven, Beast Boy's love song to Terra and Terra actually falling for Beast Boy because of it, enough to stop attempting to kill him, counts too, as it shows his faith in her having a good side paid off.
Stafire giving Robin a kiss on the cheek (even though she says she views him like "the brother" afterwards)
The HIVE five becoming good and the Titans becoming evil so Cyborg and Jynx can be together.
The photo of Batman putting his hand on a younger Robin's head lovingly framed in the Batcave. (Batman's "thanks for cave-sitting" email even had "xoxo" at the end)
Silkie telling Starfire that he loves her in "Missing"
Silkie's dream with him dancing with Starfire
The Titans comforting Cyborg on the loss of his grandma, or rather her voice.
Blackfire realizing her wrong doings and actually trying to make a bond with Starfire and the Titans.
The person Beast Boy considers to be the toughest: Raven.