The Hogwarts’s ghosts are many, but the most famous are the ones that represent the four houses: Gryffindor, Slytherin, Ravenclaw, and Hufflepuff.
Sir Sir Nicholas de Mimsy-Porpington went to Hogwarts when was his time, he was a wizard at the royal court of Henry VII, fell in love with Lady Grieve. After trying to magically fix her crooked teeth, the spell backfired, Lady Grieve grew tusks, and Nick was sentenced to death for his actions.
His sentence to death executed on 31st October 1492 by the way didn’t go as planned and that’s the reason why he’s completely beheaded.
Nick wrote a ballad about his own demise, entitled The Ballad of Nearly Headless Nick, each year he insists to take part at the Headless Hunt, headed by Sir Patrick Delaney-Podmore. Which by the way he could never take part to because his head isn’t completely beheaded.
Helena Ravenclaw also known as the Gram Lady is the daughter of Rowena Ravenclaw, who was one of the four founder of Hogwarts.
Helena attended Hogwarts At some point after starting her education, Helena stole her mother’s diadem crashed by the weight of its power, and ran away to Albania, trying to get rid of it. She hid it in a hollowed tree in a forest in Albania, same forest which years later was frequented by Lord Voldemort, in fact it became an Horcrux, after he had found were it was hidden.
Her mother became fatally ill and hoping to see her daughter one last time, sent the Bloody Baron, a man who harboured an unrequited love for Helena, to find her. In a fit of rage, the Baron murdered her when she refused to return with him, before he committed suicide out of regret for what he had done. Helena has a single dark wound upon her chest, right were he stabbed her. The Bloody Baron and Helena returned to Hogwarts after as ghosts.
A jolly fellow who resembled a monk, who was sorted into Hufflepuff back in his day, and thought by Helga Hufflepuff herself.
At some point in his life, he joined the clergy as part of a mendicant religious order, meaning that he spent his life begging in the name of charity. A noble life for a noble man. Apparently, given his physically large appearance, he indulged in the pleasures of food and drink.
His magical ways roused suspicion, and he was eventually executed after the senior churchmen grew suspicious of his ability to cure the pox, and his penchant for pulling rabbits out of the Communion cup. The Fat Friar always resented the fact that he never became a cardinal.
The Bloody Baron it’s the only ghost at Hogwarts that can give Peeves orders.
A hot-tempered sort of fellow, who was responsible for the death of the Grey Lady, aka Helena Ravenclaw. In his living days, he was simply known as The Baron. It was only at the point of his death that the ‘bloody’ part of his name was added in. And for good reason.
Head over heels in love with Helena Ravenclaw, The Baron murdered her out of anger when Helena refused to return home with him. After stabbing her fatally, he was so remorseful, he used the same weapon to take his own life.
The Bloody Baron’s chains were an ‘act of penitence’ for what he did to Helena.
Muggle Worthy Case 