Olive

When Moaning Myrtle died, everyone blamed Olive.

'She was in there because of you,' they'd shout.

Even the first ones to start bullying Myrtle – even the bullies who were the worst – told her that daily. All because of one little remark about Myrtle's glasses! The spectacles were huge and filthy! She never said one bad thing about Myrtle's complexion, or her blood, or her popularity – unlike nearly every other person. It was not her fault that Slytherin's monster chose Myrtle as their particular victim! Myrtle was the one stupid enough to skip lessons and meals to go and hide in the lavatories at such a time!

The Professors gave her filthy looks, the other ghosts would often stop and stare at her – and if they were in company of another ghost, they'd whisper – 'how ashamed she must be.'

Myrtle haunted Olive since the day of the attack. She often considered throwing an insult at the girl such as – 'Your appearance is awful even when you're dead, isn't it, Moaning Myrtle?' – but did not, in realisation it would do no good for her.

Myrtle never haunted the other bullies.

And even on her death bed, Olive finds this all incredibly unfair.