You are sorted into a house based on what you value, not the traits you posses. Percy valued the Gryffindor traits and therefore was sorted into Gryffindor.
And the element of the Slytherin house is water. Being Slytherin is in Percy's blood. Assuming you're not part of the Gryffindor Percy crowd, you will likely claim that he is a Hufflepuff due to his fatal flaw being loyalty.
Like all the Weasleys, Percy was sorted into Gryffindor, and eventually became a Prefect and Head Boy. However, he would be a much better fit for Slytherin, based on his decisions both at Hogwarts, and working at the Ministry after finishing school.
As for why she ended up in Gryffindor instead of Slytherin, which unlike Ravenclaw fits Hermione very well, it's probably because she valued ”friendship and bravery” most in the world, more than ”books and cleverness”. She is also very brave.
However, Percy's rise through the Ministry caused a rift between him and his family following the return of Lord Voldemort. His father thought that his promotion to Minister for Magic Cornelius Fudge's office was a plot by the Minister to keep tabs on the Weasleys, and through them, Albus Dumbledore.
Harry Potter - Why Was Percy Weasley Sorted into Gryffindor and Not Slytherin? (character study)
Is Percy Weasley autistic?
Percy is an introvert, in a very extroverted family. He is very rule-oriented, mature in many ways and naïve in others, a bit socially awkward, and tends to hyper-focus. These are fairly classing signs of Autism, particularly in males.
In a tense moment, Percy apologized profusely to his family, and his brother Fred was the first to forgive him. His mother burst into tears and rushed forward to embrace him, followed by his father, whom he had fallen out with the worst.
He actually asked the Sorting Hat to place him in Hufflepuff, as he was intimidated by Gryffindor's reputation for bravery, but the Sorting Hat didn't agree.
You are sorted into a house based on what you value, not the traits you posses. Percy valued the Gryffindor traits and therefore was sorted into Gryffindor. But he (harrypotter.wikia.com/wiki/Percy WEASLEY) was also very brave, especially when he decided to come back to his family and during the battle of Hogwarts.
It's pretty obvious: J.K. Rowling is a Slytherin. According to the Harry Potter Wiki, a Slytherin is known to embody the following characteristics: ambition, shrewdness, cunning, strong leadership, and achievement-orientedness. "They also have highly developed senses of self-preservation.
There had also been definite examples of half-bloods sorted into the house, including Tom Riddle, Dolores Umbridge, and Severus Snape. Harry Potter, a half-blood, was nearly sorted into Slytherin, but because he asked not to be, he was placed in Gryffindor instead.
Annabeth is Slytherin. Why? Because her fatal flaw is her ambition she is passionate and extremely determined to get to her goals. She is cunning and thinks fast she shows all these traits throughout these books and even though she is a genius and very wise, she is a leader who would definitely belong in Slytherin.
It was confirmed on Pottermore that Hermione was also a bit of a Hatstall, as the Sorting Hat saw the potential for her to be both Ravenclaw and Gryffindor. In the end, Gryffindor won out, and it's possible that Hermione wanted to be seen for being brave more than for her intelligence.
Summary. Hufflepuff is often considered the worst house at Hogwarts because it hasn't contributed as much to magic as other houses, except for a few exceptions like Newt Scamander. Hufflepuffs are known for their hard work but it rarely leads to major magical discoveries.
In true Ravenclaw fashion, Luna is an independent thinker and is never afraid to correct others. Despite being overlooked and often mocked by her peers, she never once doubts herself. She has the strength to believe in herself and her own wisdom – a trait which makes Luna Lovegood a true Ravenclaw.
Gryffindors have a strong moral code and a definite sense of right vs wrong. Hufflepuffs do have a strong moral code as well, but theirs is based more on loyalty and helping/saving as many people as they can. Dumbledore relied more on loyalty and was a more loyal person than he was chivalrous.
Luna Lovegood is a fictional character in the Harry Potter books written by J. K. Rowling. She was sorted in the House of Ravenclaw and first appears in the movies and the books in Harry Potter and the Order of the Phoenix.
The prophecy thus comes true in an unexpected way: Percy fails to save what matters most by allowing his mother to save herself. Upon returning to Camp Half Blood, Percy is betrayed by his friend Luke, son of Hermes, who turns out to be the human hero whom Kronos used for the theft.
Percy, who was right next to him, was distraught, and refused to leave Fred's body. Fred died with a smile frozen on his face, as moments before death he was laughing at Percy for making a rare joke.
On the way to camp, they are attacked by the Minotaur. Percy manages to defeat the monster, but only after it knocks out Grover and squeezes Percy's mother until she disappears in a shower of gold.
