old Harry Potter oc.
don't recall her name...just that her uncle was a DeathEater, She had a wizard Father and Muggle Mother.
She was a transfer to Hogwarts from America and made fast friend with the trio and especially the twins. She loves having fun though her studies are a bit of a struggle.
Also she used magic to permeantly dye her hair pink as a joke/ rebel against her Uncle(who she was living with after her parents were killed)