Heartwarming: The Haunting Hour aka: The Haunting Hour The Series
The end of the episode "Bad Feng Shui" in which Jessica fights back against the dark Chinese spirits who kidnapped her mother by playing her violin — as her mom loved her violin playing. Also the part where she buys a horse from Mr. Ling's store, as the horse is a sign of perseverance and she says that her mom would never give up on her, so she won't give up rescuing her mom.
The ending of "A Creature Was Stirring". The Krampus burns the family's house to the ground, but everyone survives, and the disaster causes the parents to cancel their divorce, as their kids need them now more than ever. As Timmy puts it, "This is the best Christmas ever." Quickly turned into a Crowning Moment of Funny when it's revealed that Santa Claus — riding in a stretch limo blaring Christmas hip-hop — is the one who brought the Krampus to Timmy's family because Timmy wished for something to bring his family together, and what better gift to give a strained family than a Christmas-wrecking demon.
The ending of "Pool Shark" where Kai learns that he and his father are really Nanaue (a mythological Hawaiian creature that's a man on land and a shark in the water). Kai comes to terms with this, and wins Alexa's heart by taking her on a ride through the water. Alexa is completely unafraid of his transformation.
The Reveal in Spaceman. The main character, Aaron finds out the "alien" he's been talking to was the ghost of a little boy, who loved playing as an astronaut, and whose mother kept him in the attic because she was so broken over his death that she didn't want to let him go. Aaron decides to keep the boy company, knowing he's interested in space as much as he is.
The Director's Cut version is a little darker, however, as Aaron realizes how crazy the dead boy's mother is, goes to escape when the ghost of the dead boy suggests that Aaron play with him, but the mother locks Aaron in the room, and Aaron is forced to play with the woman's dead son.
The Intruders. Eve chooses her adopted parents and baby brother over living with the Fae even if it means giving up her powers and earning the Fae's wrath. She even warms up to her baby brother, who she's resented the entire episode, managing to stop his crying when his parents couldn't. It helps that the parents in this episode are good people and they've really been trying to make an effort with Eve despite her constant attitude. Particularly there's this speech from Eve's father:
Eve's Dad: "I'm sad. Sad that you're so far away from me, from your mother... Eve, I want you to know that, no matter what you say, no matter what you do, we will always be your family. This will always be your home. You'll always be welcomed with love... I miss you, that's all. I love you kiddo."
In Really You: Lilly's mom—not knowing that Lilly D. and the real Lilly have switched places—is about to dump her real daughter into the trash bin. She notices that the doll has a mole on the back of its neck like her daughter. It's enough to make her realize what she's done and to bring Lilly back to her normal self. The two reunite in a hug.
Flight. Josh's talk with Vincent, who's a ghost, into going into the afterlife and their final goodbyes.
"Detention": Audrey talking Kate out of going into the afterlife and apologizing for causing the parade accident that killed Kate, herself, and a jock nicknamed Halftime, which got them stuck in limbo.
"Terrible Love": Stuart comforting Maggie days after she witnessed Brendon fall down the stairs (after Cupid made it so that way Brendon's love-induced rampage would end) — at least until it's revealed that Stuart set her up to be shot by Cupid.
Dead Bodies has Will and Anna being reunited. Granted there is a bit of Narm when he affectionatly calls her "Sweet Anna" but still, he has put Jake Skinner behind him, got his life back and is happy to see her.