If you have only seen the films, you might be surprised to hear that it wasn't Cho Chang who betrayed Dumbledore's Army to Professor Umbridge – it was Marietta Edgecombe. A friend of Cho's and a fellow Ravenclaw, Marietta (reluctantly) joined the DA.
When she became afraid that her mother's job at the Ministry of Magic might be threatened by her membership in the organisation, Marietta betrayed the D.A. to Umbridge.
Their relationship ends when the D.A. is exposed following Marietta Edgecombe's betrayal of the group to Umbridge. Cho defends her friend's actions by saying that Marietta simply made a mistake.
The Weasleys are known for not supporting the notion of blood purity. They were considered one the biggest "blood traitor" families within the wizarding world of Great Britain. They willingly associated with Muggles, Muggle-borns, and other "blood traitors".
Their relationship grew stronger after the death of Cedric Diggory, but Harry suspected Cho of betraying their secret student group. Cho's lingering feelings for Cedric and a lack of chemistry between her and Harry contributed to their breakup, leading to Harry ultimately ending up with Ginny Weasley.
Harry Confronts Umbridge at the Ministry of Magic | Harry Potter and The Deathly Hallows Pt. 1
Why didn't Harry marry Cho?
Because he wasn't romantically compatible with Luna or Cho. He had ONE date with Cho in which neither of them had a good time, and they really didn't have anything in common. Ron said it best; Harry needs someone more cheerful. And Cho needs someone who lets her be emotional.
Cho didn't like Ron Weasley and Hermione Granger; she believed that Harry had romantic feelings for Hermione, instead of being friends. This was one of the reasons that Cho and Harry fell apart. However, she fought with Dumbledore's Army during the Battle of Hogwarts, and the most of them survived the war.
The Weasley family is one of the few remaining pure blood wizarding families, though they were considered "blood traitors" for associating with non-pure-bloods.
Some pure-bloods were considered “blood traitors” for not only being unbiased about blood purity and towards Muggles, but for showing outright fondness and admiration for the Muggle world. The Weasleys are known for not supporting the notion of blood purity and for associating with Muggles and Muggle-borns.
She survived the war and eventually married a muggle Mr. Campbell and had a daughter named Erin. Even though Cho seemed very innocent and kind, she still couldn't get over the fact that Cedric Diggory was dead and Harry Potter, her new crush, had been right beside Cedric when he died.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
Although Umbridge was not a Death Eater, and had no direct contact with Lord Voldemort, she showed that she was fairly in line with their goals. This was due to Umbridge's callous nature and her prejudiced beliefs, both of which were similar to Death Eater behavior.
During the second war, no Slytherin student joined the association known as Dumbledore's Army; however, this is likely the fault of Hermione Granger, Ron Weasley, and Harry Potter, who only invited people they trusted, and they were known for not trusting any Slytherin due to the often rivalries they had with people ...
Mad-Eye Moody had earned the trust and respect from the likes of Albus Dumbledore, so no one would have ever suspected it was all one big ruse to lead Harry into the hands of Lord Voldemort. You know it's a good trick when even Dumbledore is convinced by your disguise and doesn't suspect a thing from you!
She showed a particular hatred for Harry Potter, as she had no qualms about violently punishing Harry during detentions (though it is possible Fudge told her to be harsh on him).
In 1995, he broke off all ties with his family following an argument with his father over his promotion to Junior Assistant to Fudge. Proud and ambitious, he could not conceive that Fudge would be using him to spy on Dumbledore.
Percy never became bad, but he did become a self centered, power hungry bigot. His love for the ministry and his obsession with his future caused him to become oblivious to the rest of his family. He spent too much time working to even notice his family's concerns for him.
Scabbers was Ron Weasley's pet rat. Passed down throughout the family, by the time he came to Ron, Scabbers was living up to his name with patchy fur and a distinct preference for sleeping.
Hedwig's killer is not explicitly identified, so he/she may have appeared in other books, films or video games, but the only known appearance is Harry Potter and the Deathly Hallows and Harry Potter and the Deathly Hallows: Part 1. A popular fan theory based on book canon suggests that Snape may have killed Hedwig.
The injury was caused by Snape's Sectumsempra spell in order to stop the Death Eaters from hurting George (who he thought was Harry) and Lupin, but missed and hit George. Hermione and Kingsley then arrived, both unharmed, followed by Arthur and Fred Weasley, both concerned for George.
Harry loved Cho more than he loved Earwax flavored beans but less than he loved chocolate frogs. Harry had a teenage crush on Cho. She was pretty and a good Quidditch player, so he liked her for her looks and nerve—it's the kind of girls he likes anyway. It was only infatuation; there was nothing deeper there.
Rowling revealed more information about Neville when she stated that he married Hannah Abbott, a Hufflepuff classmate, who became the landlady of the Leaky Cauldron. The couple live over the pub, a fact that Rowling thought people would find "particularly cool".
