His ending in IV: he leaves home to go and fight, leaving a note to his Mama, promising to come back "when I won't be an embarrassment for you anymore". The ending shows that he'd sent a letter to her saying he was in Hong Kong, prompting Samantha to fly outto him.
"People still stare at me sometimes, but I don't let it get to me. It's okay to make mistakes once in a while. As long as I get to spend time with my Mama, everything will be just fine."
Both of her endings, too. In IV, Ryu shields Sakura from BLECE before destroying it, then she helps him walk out of the S.I.N base. In the second part of her Super IV one, as she's jogging underneath a local bridge with her Akita dog... she sees Ryu walking towards her, and she runs to him in joy.
In the Udon Street Fighter IV comic, El Fuerte and Rufus end up on a Ninja Warrior-like show along with Sakura and Dan. Sakura talks with Fuerte and finds out that he's a big fan of Rainbow Mika. When Crimson Viper shows up to kidnap Sakura, Fuerte leaps to her defense. A few months after the incident, Sakura and her family show up at his restaurant in Mexico... and bring Mika along with them.
Sagat's SSF 4 ending, where he meets up with a group of Thai childrenand shows them kindness. It's really adorable to see the giant Sagat holding a little girl's hand as they walk peacefully through the rice fields with another kid and the local elder. Then it's subverted when we see it from Adon's POV in his own ending sequence: while the scene is still a sweet one for the viewers and Sagat himself, Adon is far more cynical and sees it as the proof that Sagat has grown way too soft.
Shaomei: "Although I care about the town, I care a lot more about you two... So please, don't be so reckless, okay?
Chun-Li's Third Strike ending too. Specially when she has a flashback about how she rescued her kidnapped adoptive daughter (the little girl seen in the prologue) and is seen training her and many other kids.
The Ties that Bind gives us Ryu getting out of his post-Satsui no Hado Heroic BSOD much to Sakura's joy and the scene at the end where Ryu, having won against Seth, collapses to the floor and is happily tended to by Ken, Eliza and Sakura.