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.

Quotes
"(Anakin: Lower the ship!) I can't take Dooku alone! I need you! If we catch him, we can end this war right now! We have a job to do! (Anakin: I don't care! Put the ship down!) YOU WILL BE EXPELLED FROM THE JEDI ORDER! (Anakin: I CAN'T LEAVE HER!) COME TO YOUR SENSES! (calmly) What do you think Padme would do were she in your position? (Anakin: (pause) She would do her duty.)"

- Obi-Wan Kenobi forbidding Anakin to put his love for Padme before his Jedi tasks

"Isn't this one new? It's awfully good. Looks very much like the Gypsy girl. I know... you helped her ESCAPE! And now, all of Paris is burning, because of YOU! (Quasimodo: She was kind to me, master.) YOU IDIOT! That wasn't kindness! It was cunning! She's a gypsy! Gypsies aren't capable of love! Think, boy! THINK OF YOUR MOTHER! (Frollo takes a moment to recompose himself) But what chance could a poor, misshapen child like you have against her heathen treachery? (pulls a dagger from his robe and stabs the Esmeralda doll with it) Well, never you mind, Quasimodo. She'll be out of our lives soon enough. (he holds the doll over a candle flame) I will free her from her evil spell. (tosses the incinerated doll to the floor) She will torment you no longer. (Quasimodo: What do you mean?) I know where her hideout is. And tomorrow at dawn, I attack with a thousand men."

- Judge Claude Frollo forbidding Quasimodo to be friends with Esmeralda, thinking that gypsies "aren't capable of real love."

"(Kerchak has called Tarzan, Kala, Terk and the other gorillas for an emergency meeting regarding the humans.) EVERYONE! We will avoid the strangers! Do not let them see you and do not seek them out! (Tarzan, actively protesting to the gorilla leader: They mean us no harm, Kerchak!) Tarzan, I don't know that! (Tarzan: Well I do! I've spend time with them!) You may be willing to risk our safety, But I'm not! (Tarzan gets up into Kerchak's face like he's going to fight him.) (Tarzan, defiantly: Why are you threatened by anyone different from you?) (The gorilla leader is stunned by this challenge to his authority and glares at Tarzan.) Protect this family! And stay away from them! (Tarzan sulks off in anger. His mother Kala tries to reason with her son.) (Kala: Tarzan, for once. Listen to Kerchak.) (Tarzan, angrily: Why didn't you tell me there were creatures who looked like me?) (Kala looks on sadly as Tarzan goes to a tree branch to sit alone.)"

- Kerchak forbidding Tarzan from socializing with the Porters.

"Come, Cera. Threehorns never play with Longnecks!"

- Mr. Threehorn forbidding his daughter Cera from befriending and playing with Littlefoot, who is a longneck.

"(Luke Skywalker is packing his X-Wing Fighter to go rescue his friends Han Solo and Princess Leia on Cloud City, but Yoda tries to talk him out of it so he can finish his Jedi Training.) Luke, You must complete the training! (Luke, desperately: I cant keep that vision out of my head, they're my friends. I've gotta help them!) You must not go! (Luke: But Han and Leia will die if I don't!)"

- Yoda forbidding Luke Skywalker to put his friendship with Princess Leia and Han Solo before his Jedi Training.

"Walter: Where do you think you're going, young lady? (Lola: Wherever he'll take me.) I forbid you to go out with that hoodlum! (Lola: But Daddy, I love him!) Go to your room! (Lola: I don't even live here anymore!) Well, then, go to your old room that your mother turned into a scrapbooking room! (Lola runs to her former bedroom, crying)"

- Walter Bunny forbidding his daughter Lola to go out with Bugs, who was then a biker.

"Bart: I'll come by your house later! (Marge: Oh, no you won't! You stay away from Nelson Muntz.) But, mom! (Marge: Nelson's a troubled, lonely, sad little boy. He needs to be isolated from everyone.) But, mom! (Marge: Yes?) That's all I got."

- Marge Simpson forbidding Bart to go to Nelson Muntz's house.

"Lois: What the hell did you and Bill do last night?! (Peter: We lived, Lois. We lived our lives.) Peter, that former President Clinton is nothing but a bad influence! I forbid you to hang out with him anymore. (Peter: No way. Bill Clinton makes me feel young. Not like you, with your Judd Hirsch sweater and your bag of Werther's Originals.) (Peter walks off)"

- Lois Griffin forbidding Peter to hang out with Bill Clinton.

"Ruth: You are not to see that boy again. Do you understand me? Rose, I forbid it. (Rose: Oh stop it, mother. You'll give yourself a nose bleed.)"

- Ruth Dewitt, unallowing her daughter Rose to be with Jack Dawson

"A cat can't have a rodent for a master. What is this world coming to? It's against the laws of nature!  If word of this gets out, it'll be bad for cats all over."

- Smokey, warning Snowbell against Stuart Little

"This is my land! I make the laws here! And I say anyone who so much as looks at an Indian without killing him on sight, will be tried for treason and hanged!"

- Ratcliffe, forbidding John Smith to fall in love with Pocahontas "(Woody: HELP! BUZZ! GUYS!)  Stinky Pete: It's too late, Woody.  That silly Buzz Lightweight can't help you.  (Woody: His name is Buzz Lightyear!)  Stinky Pete: Whatever.  I've always hated those upstart space toys."

- Stinky Pete, telling Woody against his friendship with Buzz