Heartwarming / Durarara!!

Warning: Unmarked spoilers abound!

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General

• "Because the world isn't as cruel as you take it to be."
• Mikado's constant attempts at protecting Anri.
• Just the fact that while Mikado, Masaomi, and Anri are leaders of rival factions, they still care deeply about each other.

Light Novel

• In the Everyone Gets Along omake, Mikado reveals that he cried when he found out that Kida was moving to Tokyo, but is still too embarrassed to tell him. It's not really surprising considering their relationship, but you can't help but gush about it anyway.

Durarara!!

• Kadota's band reuniting with Kaztano in episode 6, after working all night to rescue him from kidnappers. Followed by the six of them going for breakfast at Russia Sushi, happy as can be.
• Celty having a dream in which she sees her head. "I am here, I am here."
• Walker and Erika finally finding each other at the end of episode eight. They start dancing with each other in the middle of the street.
• Shinra and Celty's conversation in Episode 12. After twenty years of one-sided loving on Shinra's part, they finally reveal their secrets to each other and proceeded to punch each other for realizing how stupid they've been. Celty's punch was enough to send Shinra flying across the room, while Shinra's only knocked Celty's helmet off to see her headless form, claiming that he's always seen her as beautiful.
  Shinra: That punch is to replace our wedding kiss, okay?
  • ...which makes a nice callback to episode 4 when Shinra met a street artist who wanted to draw a Dullahan but kept forgetting how the head looked in his memory. Shinra, fully knowing that the man was trying to draw Celty, insisted that the picture's perfect the way it is, headless and all.
• Shinra and Celty's conversation with Shingen in Episode 14. Noticing a pattern with those two? Of course, this being Shingen, it is also a Funny Moment.
• Kadota's van gang helping him rebel against the Blue Squares and save Saki in episode 18.
  Kadota: So are you guys sure that you're cool with this?
  Walker: Our loyalty lies with you, not those guys. We couldn't care less about the Blue Squares.
• When Simon types out 'save him' on Celty's PDA when she asked about Kida.
• You might have to squint a bit to see it, but in episode 23, when one of Saika's children stops Horada from killing someone, because "it would make Mother sad." He wasn't ordered to intervene, he just did, proving that despite all of Saika's Blue-and-Orange Morality, her daughters really do love her.
• Episode 24, when Masaomi and Saki reconcile.
• In episode 25 we have a small, subtle example but an example nonetheless. As a man with a knife tries to kill Kasuka he's suddenly hit by a sign, obviously thrown by Shizuo. Kasuka turns to look at Shizuo hiding in the crowd. And when Shizuo splits, Kasuka gives a tiny, adorable smile. Perhaps the only genuine smile the guy has had on the show. It really shows how much the Heiwajima brothers care about each other.
• Minor, but still warming. In the first ED of the anime, look at the black "shadow" that's between and behind Shinra and Celty◊. It forms a heart.
  • On that note, as creepy as their relationship is, there's something adorable about the way Seiji and scar-neck girl/ Mika are holding each other in that ED.

Durarara!! x 2

• Celty trying to cheer Akane up by making a fake head for her horse Shooter. She's really trying her hardest not to scare the little girl.
• In a weird way, Rocchi's relentless helpfulness toward the ladies can make you smile. He just wants to protect them...even if he gets carried away with the stepping-on-the-robber's-legs-so-they-break type of thing.
• Chikage Rokujo (Rocchi) befriending Kadota after losing to him in a fight.
  • Then later, after Kadota is put into a coma after being hit by a car, Rocchi drops by the hospital, hoping to pay his respects. He also attempts to find who was responsible for hitting Kadota.
• Shizuo is on the run from the Awakusu after being framed for murdering several members of their group (thanks to Izaya). However, after examing the photos of the corpses, Shinra is able to smooth things over with Awakuso group and prove Shizuo's innocence by episode 12 of Shou. This earns Shinra a thank you phone call from Shizuo in episode 4 of Ten (and the x2 Ten OVA). According to Shinra, that's a very rare thing.
• In volume nine's epilogue (which is also episode 9 of x2 Ten) where the Orihara twins admit that as much as Izaya treats them like anyone else, they'll still think of him as family. Also, even though he denies it, both readers and twins know Izaya arranged for Celty and Eijirou to protect them.
• Finding out Izaya cares for Shinra and considers him a friend.
• Shizuo's speech about Celty when confronting Kasane Kujiragi (who had captured her).
  Kasane: How can you call a raging monster your friend?
  Shizuo: Look, lady, ever since I was a little kid, there ain't been a day when I haven't been called a monster. I know what it's like to lose my shit, too, but sometimes Celty was there to talk me down, and I was lucky she was... real lucky. She saved my ass just by giving a damn about me. I owe her. So now it's my turn to save her ass.
• When Anri reveals Saika to Kadota and several others in the van, she's baffled that no one's afraid of her because she believes she's not human. Kadota convinces her that's not a problem.
  Kadota: I wonder, what do you think Celty'd say to that? I mean, she's way less human than you are, that's for sure. But still, everyone here likes her. You want to know why we're not afraid of Celty? It's 'cause we know the kind of person she is. We've seen what she's done for us and for others. What makes her happy, and sad. We're cool with who she is, just like we're cool with who you are. You seem like a good kid. Besides, you never gave us any reason not to trust you... yet. So go easy on yourself.
  • The speech is followed by a hug from Mika when Anri breaks down into tears.
• Shinra's second encounter with Kasane Kujiragi is pretty much the most touching Rejection Affection scene you could see.
  Kasane: Forgive me for being blunt, but do you think you could love me as I love you?
  Shinra: Sorry, but I'm afraid I can't return the sentiment. I should be angry. I mean, after everything you put me through, but I'm not and you know why? It's because I have Celty. See, with her, I don't need anything else in my life. She's the reason I can talk to you like this. The reason I'm happy. I'm who I am because of her. That's why you feel about me the way you do.
  Kasane: Very well. Hearing you say it so clearly, I have to accept it.
  Shinra: The kind of love she and I have anyone could have. Would you like me to prove it? A guy like me and a headless rider, she and I couldn't be any more different, but even so, the two of us fell in love... somehow. You will, too, I promise. Until then, it doesn't matter if it's family or yourself. The important thing is to love someone.
  Kasane: (smiles) What a horrible person you are. First you reject me, then you make me love you more.
• The end of the last episode of x2 has almost everybody get either a happy ending or a second chance. Shinra risks his life and succeeds in stopping Celty from leaving Japan after she regains her head. Celty's head gets sent to Chicago for safekeeping while the rest of her goes back to living with Shinra so they can be together as long as he lives. Seiji and Mika are still as insane as ever, but there's something bizarrely heartwarming about how they decide to go together to Chicago even though Seiji knows she wants to destroy Celty's head and she knows she would have a better chance of doing so if she went on her own. Varona says goodbye to Shizuo with the intent that they will meet again. While Mikado is recovering in the hospital from the knife attack, Anri admits to Akabayashi that while she can't tell for sure, she's probably in love with Mikado. Finally, Mikado wakes in stable condition to find that his dearest friends Kida and Anri were waiting for him all along, and as the three of them clasp hands Mikado thinks about how he doesn't need the excitement of the extraordinary he was looking for anymore, as long as he can continue to live in Ikebukuro with the people he loves.