What are the names of each Hogwarts house and their corresponding ghost?

Answer 1

At Hogwarts there are four houses named; Gryffindor, Slytherin, Hufflepuff and Ravenclaw. Each house has it's own trait, colours, ghost and important artefact.

Gryffindor was formed by Godric Gryffindor and holds the bravest students to pass through Hogwarts. The house colours are red and gold and the ghost is Nearly Headless Nick who prefers to be called his full name Sir Nicholas de Mimsy Porpington. Harry calls him Nick as do many students. Godric's Sword was the important artefact for this house and helped Harry kill the Basilisk and destroy horcurxes as well as helping Neville kill Nagni - another horcrux.

Slytherin was formed by Salazar Slytherin and holds the cunning folk. Contrary to popular belief not all slytherin students were pure-blood. Voldemort himself was half-blood. The colours for slytherin are green and silver and the ghost is the Bloody Baron who is the only person in the school who can control peeves and loved the Grey Lady. Salazar's Locket was the important artefact of slytherin and was one of Voldemort's horcruxes.

Hufflepuff was formed by Helga Hufflepuff and holds everyone else. The colours for hufflepuff are yellow/gold and black. The ghost is The Fat Friar. Helga's Cup was the important artefact for this house and was one of Voldemort's horcruxes.

Ravenclaw was formed by Helena Ravenclaw and holds the smart people. The colours for this house were blue and bronze and the ghost is The Grey Lady daughter of Helena Ravenclaw who stole her diadem and was loved by the Bloody Baron. The diadem was one of Voldemort's horcruxes.
Gryffindor- Nearly Headless Nick

Slytherin- The Bloody Baron

Ravenclaw- The Grey Lady

Hufflepuff- the Fat Friar

Answer 2

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