The original Star Wars trilogy introduced fans to so many incredible characters and excellent dynamics between them but rarely were these relationships smooth and easy. Rivalries formed everywhere across the trilogy, obviously ones on a Galactic scale between the forces of good and evil, but also smaller, more personal ones.
Between the heroes of the story, there are a good handful of stormy relationships. Some last the whole trilogy and are just ingrained in the characters, some are between villains and heroes who have a personal connection, and all of them are great to watch.
Darth Vader & Imperial Officers
The relationships between Darth Vader and the various Imperial Officers are pretty stormy.
All the officers below him fear Vader, and the ones who dare to disagree with him, get on his wrong side, or fail him in any way often find themselves on the end of a Force choking. Though these relationships aren't central, they are stormy.
Obi-Wan Kenobi & Luke Skywalker
The classic Master/Apprentice relationship between Obi-Wan and Luke is just that throughout A New Hope and is deceptively layered in its nature.
Of course, it does start a bit stormy with Obi-Wan wanting Luke to leave Tatooine and Luke refusing to leave his Aunt and Uncle. Obviously, that does not last long, but tensions rise between the two again when Luke confronts Kenobi about not telling him about his father.
Han Solo & Lando Calrissian
When Lando first introduced himself to audiences and reacquainted himself with Han Solo and Chewbacca, it did seem as though whatever issues they had in the past had been buried.
Then the Empire arrived on Bespin, and it became clear Lando had betrayed his friends. He even got Han frozen in carbonite, potentially killing him. This issue seemed to be forgotten about quickly in Return of the Jedi, but that betrayal resulted in a couple of unpleasant scenes for Lando, including a punch from Han and some choking from Chewie.
The Emperor & Darth Vader
The relationship between Sidious and Vader is as tense as they come. While they do not argue much in the trilogy, the power dynamic between the two is evident.
However, Vader does end up killing Sidious. It is a satisfying end to the torture, torment, and manipulation Sidious is shown to put Vader through across all the comics and the prequel trilogy.
Yoda & Luke Skywalker
The relationship between Luke and Yoda is like a more advanced, in-depth version of Luke and Obi-Wan and is one of the best in the whole Skywalker saga.
The two find themselves at odds, or rather Luke finds himself at odds with Yoda as he gets frustrated with his Jedi training. Yoda is doubtful about Luke's mindset and ability to control his emotions, leading to him impart some incredible wisdom on Luke. Seeing Luke get so frustrated with Yoda is a great part of his journey and maturity.
Han Solo & Luke Skywalker
The friendship between Han and Luke is one of the first to truly blossom and develop in Star Wars.
Their relationship is very tense at first, though. Han's skepticism of the Force and selfishness mixed with Luke's eagerness to become a Jedi, save the princess, and help the Galaxy, leads to some arguments. After A New Hope, the two fight less, but quarrels pop up now and again, and it is always fun to watch when they do.
Darth Vader & Obi-Wan Kenobi
It was made very clear in A New Hope there was a lot of history between Obi-Wan and Vader, making it far different from your run-of-the-mill bad guy vs. hero story.
Obviously, Obi-Wan and Vader do not interact in the trilogy outside of their fight in A New Hope. Still, in that alone, there is a lot of dialogue that highlights just how personal that relationship is, and given everything fans find out after the fact, it makes their fight all the better.
R2-D2 & C-3PO
Threepio and Artoo are the first duo fans are introduced to in the original trilogy, and they also bicker like an old married couple right from the get-go.
Their arguments are so often meaningless and are simply the quarrels of two old lifelong friends going at each other's mechanical throats over the smallest things. No matter how small their various arguments are, though, they are an absolute joy to watch.
Han Solo & Leia Organa
A stormy relationship with a lot more weight to it and far more stakes is between Han Solo and Leia Organa, arguably Star Wars' best and most iconic romance.
The two do not get on in the early parts of the trilogy; Han thinks she is pretentious, and Leia thinks he is nothing but a selfish scoundrel, but this tension eventually turns into romance. However, even when the two finally get over themselves and admit their love, they still find time to quip at each other.
Darth Vader & Luke Skywalker
Like Vader and Obi-Wan, the rivalry between Luke and Vader is very complex, and it has to be mentioned among the more personal rivalries in the trilogy.
The reveal that Vader is Luke's father is one of the most important and well-crafted twists in cinema history. In Return of the Jedi, the two have an interesting dynamic as Luke tries to drag his father back to the light. Vader, meanwhile, has an inner struggle with himself, torn between his dark and light halves.