Forbidden Friendship

A character wants, very badly, to be friends with someone specific. But sadly, the rules of family or society look down upon the friendship, and won't allow it. There's a number of possible reasons for this: If their relationship is or becomes romantic, they may be Star-Crossed Lovers. All of this can be affiliated with Heroic Disapproval.
 * Prejudice. Whether it's class differences, racism, or any other difference, an entire group of people is declared "evil" and must be avoided if one is to be socially accepted.
 * Personal vendetta. Sometimes one family hates another, and won't allow their own to hang out with the other family. Not everyone in the family shares that dislike, however, and they might become friends anyway.
 * Safety. Sometimes the society or family has a fear of a specific individual, whether warranted or not. And who wants to see their friend hanging around someone who might kill them?
 * Bad influence. Sometimes the specific individual isn't so much a threat to the character, as to society's value system. Friends who do drugs, get into trouble, and so on, might be disallowed as company for the main character.

Examples

 * 20th Century Fox
 * Ruth Dewitt Bukkater unallows her daughter Rose to be with Jack Dawson.
 * Yoda The Jedi Master forbids Luke Skywalker to put his friendship with Princess Leia and Han Solo before his Jedi Training.
 * Don Bluth
 * Mr. Threehorn forbids his daughter Cera from playing with Littlefoot, who is a longneck.
 * DreamWorks
 * Disney/Pixar
 * Kerchak forbids Tarzan from socializing and interacting with the Porters.
 * Stinky Pete, telling Woody against his friendship with Buzz.
 * Big Mama, discouraging Tod from continuing his friendship with Copper, whom she fears might grow up to hunt down the fox, like the hunting hound he is supposed to be.
 * King Triton forbidding his daughter Ariel to have contact with the human world, especially Prince Eric.
 * Judge Claude Frollo forbidding Quasimodo to be friends with Esmeralda, thinking that gypsies "aren't capable of real love."
 * Ratcliffe threatening to hang John Smith for befriending Pocahontas
 * Simba harshly demaning Kiara to stay away from Kovu.
 * Django unallowing his son Remy to be with the Parisian humans.
 * Mother Gothel telling Rapunzel to stay away from with Flynn Rider, as he's nothing but a common thief.
 * Others
 * Romeo Montague & Juliet Capulet have a forbidden romance, due to their rivaling families.
 * Mother Gothel telling Rapunzel to stay away from with Flynn Rider, as he's nothing but a common thief.
 * Others
 * Romeo Montague & Juliet Capulet have a forbidden romance, due to their rivaling families.