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This is not, for sure, first post about this topic but I think it would be nice to open discussion about that again. Every House has its good and bad traits. The question is... what are the most negative traits of every house?
Gryffindor
Some of Gryffindor possitive traits are bravery, courage and determination. That's are also traits of Knigts. Negative traits would be stubbornness, hastiness and emotionality. However, that all make from them best warriors for good side, however they can go to far and became Templar Knight trope.
Ravenclaw
Some of Ravenclaw possitive traits are wisdom, inteligence, creativity, and learning. That are traits of Scholars. Negative traits would be arrogance, nitpicking, and dreaminess. That all make from the best advisors, but they can became to much arrogant and do not listen another opinions.
Hufflepuff
Some of Hufflepuff possitive traits are Hard-Working, Loyalty, Patience and Fairness. That are traits of Monks. There are negative traits more difficult. It would probably simplicity, quick judgments and ordinariness. They can be amazing healers and supports.
Problem of Hufflepuff is that it's litteraly "average" House. I know it sounds rough, but Helga wanted everybody in her House and that can sometimes make some mess. In rest of houses are just people with most of the traits of their House, but Hufflepuff can has just one or two traits and be totally different than typical Hufflepuff with typical traits.
Cedrik Diggory is example of best of Hufflepuff. Susan Bones is clear Hufflepuff. However, Zacharias Smith is "the rest".
Slytherin
Some of Slytherin possitive traits are ambitions, determination, resourcefulness and cunning. That are traits of Leaders. Funny thing is that most of Slytherin traits are neutral. I wrote something about that here.
However, negative traits of Slytherin would be callousness, ruthlessness and elitism. Slytherins can be amazing leaders but they be easily blinded by their power and just want more, that is one of many reasons why was so many Death Eaters from Slytherin. But also it's reason why I believe that Fudge and Crouche were also Slytherins.
What you think about negative traits of every House?