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6

Its a matter of how much magic/time is poured into them. The portraits are enchanted, and some are further taught to act that way. From JK Rowling herself, via Pottermore: When a magical portrait is taken, the witch or wizard artist will naturally use enchantments to ensure that the painting will be able to move in the usual way. The portrait will be ...


6

They could, but they chose not to. This is answered in the books on which the movies are based. After Sirius's death, Harry asks Nearly Headless Nick, the ghost he knows best, whether there's any possibility of his godfather coming back as a ghost: "Wizards can leave an imprint of themselves upon the earth, to walk palely where their living selves once ...


5

There's a choice of possibilities... According to Dumbledore, the Ministry of Magic can detect when magic has been done near an underage wizard, but not who actually performed it. So on a train full of underage wizards it's perhaps just too difficult to enforce the rule. More likely, the Hogwarts Express is deemed an extension of school property, so it's ...



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