How could nobody have mentioned the time when Goku finally comes back after recovering from his heart virus, and teleports onto the plane Gohan and Krillin are in.
Goku: "Hi Krillin!" Krillin: "Goku!" (tackles Goku while crying Tears of Joy)
The intro to the latest Dragon Ball Z TV special is one, taking Opening Shout-Outs and combining them with happy glimpses into the lives of all the main characters, with a V-Formation Team Shot at the end. And then there's the rest of the special...
Vegeta, while fighting against Super 17, remarks that he is an Earthling who carries the heart of the Saiyans.
Also from DBZ, after Goku throws the Spirit Bomb and obliterates Kid Buu, he floats down slowly to the face-in-the-mud Vegeta, holding out a thumbs up, saying "We make a pretty good team after all, don't we?" Vegeta's head slowly lifts, smirks, and he returns the thumbs up.
Goku's proposal to Chi-Chi. As a stupid little kid, he mistook marriage for a kind of food (understandable, given thisisGoku...), but when he's grown, he nearly breaks Chi-Chi's heart when he tells her so, and then turns around and proposes for real. It's a miracle he could disengage his arm from her embrace to fight Piccolo Jr. (or Tien Shinhan, for that matter).
Even more heartwarming is when they finally get married in the last episode of the Dragon Ball anime.
Goku: "Sometimes my brain doesn't know what my mouth is saying. Good thing my heart does. Will you marry me?" Chi-Chi: "Yes!"
Goten was so moved by this scene, he sucked his thumb briefly.
Pretty much any time the incredibly emotionally stunted Vegeta and #18 show that they care, especially #18 - at least with Vegeta you get the constant idea that Earth has been slowly growing on him through the series; with #18 you get a while before she shows, however briefly, that she actually cares about anyone - until then you get the idea that she's just hanging around everyone out of habit rather than friendship. Her yelling out to Krillin before his Heroic Sacrifice against Super Buu was a nice "awww, she does care!" moment, even if she and everyone elsediddie immediately afterward.
We even see that Vegeta cares for Gohan and Goten, as well; when everyone believes that Buu has killed Gohan, Vegeta is enraged and mentions this as one of his main reasons for wanting to kill Buu. Later on, after Earth is destroyed by Kid Buu's Planet Buster Bomb attack, Vegeta snaps at Goku, not that he let his son die, but that he let their sons die.
All of the reunion scenes after Vegeta, Gohan and all of the Z-Fighters' friends and families are wished back to life at the end of the Kid Buu Saga. Some of them are anime-only, but still. Special mentions go out to Krillin's family - when his daughter runs up to him for a hug, and he looks up to see 18 coming out of the shadows, smiling and waving.
Gohan landing behind Videl and tapping her on the shoulder... and she turns around, is shocked to see him, and starts crying and beating him on the chest - all while Gohan just looks adorably confused.
Vegeta dies fighting Majin Buu. Yamcha wishes for Shenron to bring everyone who isn't evil back to life, and Vegeta stays dead. Flash forward about a day and a massive epic bitch fight, in which Fortuneteller Baba briefly brought Vegeta back from the dead because Goku needed a distraction help. Dende wishes for Porunga to bring everyone who isn't evil back to life, and this time? Vegeta is reincarnated along with everyone else. The look on his face is just amazing.
The first part is justified - Shenron can't revive someone who already died and was brought back once (Vegeta was killed and revived already during the battle against Frieza) meaning that, regardless of whether or not Vegeta was a good guy at the time, he couldn't be brought back. Porunga on the other hand, can revive the same person multiple times.
Pretty much any scene of Gohan and Piccolo will have an "aaaawwwww" factor to it, but Piccolo's Heroic Sacrifice in the Saiyan Saga is an obvious one to cite. A more subtle one is Gohan's rock-steady, not-taking-no-for-an-answer insistence (even going so far as to yell at his mother to be quiet when she protests) on climbing aboard a centuries-old spacecraft and visiting an alien planet so that he could be the one to personally wish Piccolo back to life. Consider that, prior to this point, Gohan was a sweet, shy crybaby who rarely raised his voice. He's five, by the way!
Especially changing out of his "school clothes" on the ship into a Piccolo-style outfit in his honor. Now THAT was awesome. He'd wear it until trading it in for battle armor after the battle with the Ginyu Force. But he would continue to wear Piccolo-style outfits for the most part throughout his childhood, culminating with a full outfit, complete with weighted shoulder wear and turban, at the Cell Games. He'd even wear a white bandana occasionally as the Great Saiyaman.
This realization makes me view the Great Saiyaman as less Narm and more "awww", but only a little...
Think of it this way: it's Narm with the helmet, it's "awww" with the bandana.
Everything about the episodes where Hercule and Majin Buu become friends. Best example; earlier on, Hercule tricks Buu into lying down so he can take a picture of himself standing triumphantly over Buu as "proof" that he "defeated" Buu, but after he and Buu have actually become friends (and had helped save a puppy from a fatal wound), Hercule remembers the picture and, realizing how wrong it was to take advantage of Buu's naivete, tears it up and throws it away. Such a far cry from when he was willing to take undeserved credit in the previous saga.
Let's not forget Buu healing the blind kid earlier. It showed to the audience that Buu could be a good person once he got past his serious lack of knowledge about right and wrong -- something that Hercule was quite willing to fix upon learning this himself.
However, this quickly gets sour when Buu flies off to get some milk for the boy. He finds an innocent man simply unloading from a truck, then proceeds to turn this man into a carton of milk. Milk that he then gives to the child. IT'S PEOPLE.
In addition to showing that Buu could be a good person, the meeting with the boy is a red herring to those who think that Buu is going to turn over a new leaf BECAUSE of his meeting with the boy. Well, if turning a man into milk doesn't convince you that he's still not a good guy yet, check out what he does right after he leaves the boy.
Goten and Goku's first meeting (anime only). Goten is six years old and has never met his father before; he hides behind Chi-Chi's skirt for several seconds, staring in silence... then abruptly screams "Daddy!" and rushes into his arms. Even Piccolo was smiling.
Android 16's interaction with Dr. Briefs' cat, Tama.
A particular scene comes to mind from the last Z film Wrath of the Dragon. Early on, the film features a scene with many of the main characters enjoying an evening barbecue. Trunks and Goten's hands are shown sneaking up from underneath the grill grabbing skewer after skewer of shish kebabs, intending to give the food to Tapion. Goku notices them and breaks into a very warm smile and silently moves the last skewer over on the grill towards Trunks' hand.
Another scene from Wrath has Vegeta, who had entered the fight with Hirudegarn with his typical self-centered reasons (his first day off in a month and some monster attacks his home) and is smashed into a crowded office building. Hirudegarn prepares a fire breath attack and Vegeta glances at the people near him and expends all of his energy creating a barrier that shields everyone from the attack. It's a small moment but it shows just how much he's changed from the Axe Crazy mass murderer he was in the Saiyan Saga. To cap it off, we later see the very same people he had saved helping him up.
The entire Red Ribbon Army Saga is the ultimate heart-warming story of Dragon Ball. It completely embodies the spirit of the original series. It's just Goku as a child wandering the world searching for his lost four-star Dragon Ball and meeting a lot of new friends and enemies along the way. He rescues Android 8 and the village elder from General White, he gives away his own heirloom just to resurrect Upa's father, and moved to tears, he meets his grandfather while fighting at Baba's palace.
The aforementioned brief reunion between Goku and his grandfather was the one time in the entire series this troper really had the tears going. Throughout the series thus far, it had seemed like Goku never got any real awards for his good deeds. So to finally see it all pay off by giving him a brief reunion with his loving grandfather was truly heartwarming, especially watching Goku's inner-child return to him as he rushes into Gohan's arms.
The climax of the 22nd Tenkaichi Budokai in the anime, which led to the fight being taken a few miles outside the arena but ended in Tien Shinhan (while completely unconscious) barely winning the match because Goku was unfortunate to land first (he flew into a van), the entire audience vacates the arena and runs towards the two combatants to applaud them. Later, a large man offers to hold Tien on his shoulders, claiming he must be exhausted from the fight. Keep in mind that, just hours before, Tien was very much the biggest Heel seen in a Tenkaichi Budokai thus far and only changed his ways during the fight with Goku. The same is almost done with Goku, and the two are brought closer together to congratulate each other, and they just smile at each other. Sadly, the end of the episode has a horrific case of Mood Whiplash when Tambourine arrives and murders Krillin by breaking his neck, thus setting the stage for the King Piccolo Saga.
I always liked this one scene from the Frieza Saga with Vegeta and Krillin. It starts out with Vegeta telling Krillin that he has to hurt him badly in order for Dende to heal him and make him stronger. There's only one problem, Krillin can't bring himself to hurt Vegeta! It was sweet to see that Krillin had started taking Vegeta's presence on the good-guys' side for granted. Not to mention this is coming from the man who, just a few months ago had argued that Vegeta should be killed. He actually wanted to deliver the blow HIMSELF! Vegeta's reaction to Krillin's blubbering was fun to watch too. You could tell he really had no clue why Krillin was hesitating, though his reaction is more like a Crowning Moment of Funny.
The Ginyu Force exist because Toriyama used to watch Super Sentai with his son. This is cute enough, but reaches CMOH levels because Toriyama mentions in his intros in the tankobon that he was often too busy with the manga to spend time with his family.
The development of Gohan and Videl's relationship throughout Z in its entirety.
This troper just gushed at this instance when I saw it in the DBZ anime (not sure if it's in the manga or Kai, haven't gotten that far in either yet), but after Goku had been deathly ill from the heart virus, he remarks to Chi-Chi and Master Roshi that he's going back out to fight the androids. Chi-Chi of course is against it at first, nearly losing her husband already with the heart disease (seeing her watch over Goku when he was sick made this troper smile and cry). But the two eventually come to an agreement, knowing she can't stop her husband from going back out there, with the promise that he'll save the earth from the androids. Then... one of the RAREST things I've ever seen. While it's out of focus, we only see up to Chi-Chi and Goku's shoulders. But from the look on Master Roshi's face, and the way Goku's hand tenderly squeezed Chi-chi's shoulder-leaning a bit closer to her body...it's easy to assume that Gokuactually gave his wife a goodbye kiss! This was such a rare moment to see between the two this troper teared up in happiness! The whole scene was screaming "Aww, look they really do love each other!".
This troper has never considered Dragon Ball GT canon except for one moment: a flashback to a "family and friends" day out at the beach, before Goku went off to train Uub. Goku, the guy who's always leaving his family behind to fight or train or both, said something that made me almost tear up.
Pan later uses a photo of that very day out to stop Golden Great Ape Goku's rampage, which enables him to become a Super Saiyan 4 and fight back against SSJ3 Baby Vegeta.
Chichi:"It's days like this that make all of the hard times we’ve been through seem worth it." Goku:"Well, I have to admit, I do miss all the fighting. *turns to look at Chichi, smiling* But here, I get to be with you guys!"
When Krillin has the opportunity to deactivate Android 18 but can't bring himself to do it. This could even double as a Tear Jerker
Krillin: "I can't do it. I love her."
After gaining his "Ultimate Gohan" form, Gohan has a heartfelt goodbye with his father before going off to face Super Buu, with Goku believing this is the last time he'll see Gohan until his eventual death. It wasn't, but still, incredibly touching.
The ending of the episode "The Fight is Over... Thank You, Son Goku!" where Gohan has just defeated Cell and the Z Fighters (including Vegeta) all gather with smiles on their faces around an exhausted but smiling Gohan after his victory.
The thoughts of the Z-Fighters as they come to Gohan's aid, knowing that they are completely outmatched against Cell, but still can't leave themselves to let Gohan fight him alone. Really, that entire episode is a combination of Tear Jerker, Crowning Moment of Awesome, and Crowning Moment of Heartwarming for almost all the Z-Fighters. Piccolo, Tien, Yamcha, and Krillin note how much having Goku and Gohan in their lives has changed them, spurring them to put it on the line to help Gohan after Goku's sacrifice. Even Vegeta finally gets moved by Goku's death, Gohan's fight, and the Z-Warrior's struggle, to finally finish breaking that shell he has around himself. This moment marks his biggest character development, as he fights to help former enemies and rivals he's only held at arm's length. The moment when you see his Big Bang Attack mark the absolute end of the fight by giving Gohan the chance to finish Cell, for all of these reasons, will give you Goosebumps.
When Future Trunks first arrives in the present timeline, the first two to really trust him and accept the offered drinks are Bulma and Gohan, his future mother and mentor/best friend, respectively. Trunks has this little smile on as he watches the younger counterparts of the two people most important to him.
Also, while waiting for Goku, Trunks keeps stealing glances at Vegeta and again, has this little smile on as he meets his father for the first time.
In a filler episode as Goku is relaxing with Krillin before the Cell Games, he admits to Krillin that he isn't sure that if they are strong enough to defeat Cell, but he doesn't want Chi-Chi or Gohan to worry and he wants to spend as much time with his family should anything happen.
Goku: "These are precious times, Krillin. Being together is everything. That's all that really matters to me right now."