Simba: I can't marry her, she's my friend!
Nala: Yeah, it'd be so weird.
Childhood Friend Romance is a part of romantic plots, when characters develop romantic feelings for someone who they spent their childhood years with.
Often the pair will see each other as Just Friends (and may even deny accusations that they might have a different type of relationship); then, when puberty hits or when they meet again after being apart for some time, they will realize that the other is all grown up. If the pair goes through a Puppy Love phase from the very beginning, a Childhood Marriage Promise may be involved.
Resistance to see a childhood friend as a potential romantic partner is known as the "Westermarck Effect", a theory that claims that people who grew up together before the age of 6 are likely to become hardwired to think about each other Like Brother and Sister, with a Stupid Sexy Friend squicked reaction to the notion of romance. (Other studies question this on the basis that though few of the people they examined had major romantic relationships with childhood friends, many had crushes and romantic feelings that just didn't make it.)
As an Ending Trope, spoilers ahead. Just the Title is a spoiler in this case!
Subtrope of Childhood Friends.
- Anime & Manga
- Comic Books
- Fan Works
- Films Live-Action
- Live-Action TV
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- Visual Novels
- Western Animation
- Real Life
- Carl and his deceased wife Ellie in Up. Much of the plot revolves around his pain from believing that he failed to fulfill his promise to her.
- The Lion King: Simba and Nala. They grew up playing around and then, after they finished growing up, they became the Ruling Couple of the Pride Lands.
- Derek and Odette in The Swan Princess. Though it started as an Arranged Marriage that they both protested, and they didn't really get along, love came quickly once they were adults.
- Nita and Kenai in Brother Bear 2. The whole plot revolves arounds them because Nita is in an Arranged Marriage but she can't marry her betrothed because the spirits already consider her married to Kenai through a little necklace he gave her when they were kids.
- This trope is heavily implied in Epic between Queen Tara and Ronin. Queen Tara makes playful digs at his serious nature, flirts with him, and is constantly trying to convince him to smile during the pod ceremony. Meanwhile, Ronin makes it all too obvious that he's crushing on her big time. Of course she's murdered before any of it can come to fruition, and several characters can't help but mention it when they hear the news.
- In Jack and the Cuckoo-Clock Heart, Joe seems to be harboring a crush on Miss Acacia from even before the titular Jack showed up, but it doesn't end favorably for him.
- In The Book of Life, Manolo and Maria were close friends before she left to study abroad. Both fell in love 10 years later and become husband and wife by the end.
- Frozen: Averted with Anna and Kristoff, who technically meet once as children, but never see each other afterwards as Kristoff is taken in by the trolls while Anna is shut away in the castle along with her sister.
- Frozen II: Agnarr and Iduna met as children during Arendelle's expedition into the Enchanted Forest. However, Agnarr wasn't aware that Iduna was the Northuldran girl he met until she revealed it to him in their adulthood.
- Madagascar: Gloria and Melman. Though they're only friends during the first movie, it's shown in the sequel's opening sequence that both grew up in the Central Park zoo, and Melman always had a crush on her since that moment. Later in the movie, Gloria would start a relationship with Melman after leaving Moto Moto, which remained in the third movie onward.
- Billy and Emily in Annabelle's Wish start off as childhood friends, with her helping to defend him from the local bullies who taunt him for losing his voice. At the end of the movie, after a long Time Skip, they're shown to be married.
- Storm Blackfire (a character in the Jade Regent Actual Play podcast series from RPGMP3) is a half-elf barbarian and combat expert. She's on very good terms with her childhood friend, Sandru. At one point, she acquired a magical glow-in-the-dark butterfly tattoo on a certain part of her body, which is difficult for her to conceal under her... usual attire. Luckily, her magical sword imbues her with cold-resistance.
- Whateley Universe qualifies. Jadis' bestest bud from elementary school, who she hasn't seen in years, is now at Whateley Academy with her, but already has found a girlfriend. Only Jadis is the daughter of the internationally feared supervillain Dr. Diabolik, so things could change in a lot of ways...
- Parodied in Doppelgänger with Lisa
Victor: You know, maybe what I always really wanted was right here... *leans into kiss Lisa*
- Love Gives Me Hope:
- Dan Roth from The Nostalgia Chick is the ultra-unlucky version, as he dated the titular Chick back in high school, but is now her roommate who is constantly either abused or forgotten.
- Edmund and Elanore meet again after a long absence and eventually the Count's appearance forces a Love Triangle.