Harry Potter soulmate
Wizards and witches are Born with Soulmarks. It doesn't matter if your A Muggleborn, Half blood Or pure blood, They all get Soulmarks.
A soulmark is the full name of Your soulmate.
Soulmates are strictly Romantic, But you don't have to be in a relationship with them, If they don't want to be with their soulmate All they have to do is State I (Full name) Reject my Soulmate (full name) so more it be, And then both Soulmarks will Burn As the names Vanish.
Most purebloods Reject their Soulmates if they are Muggleborn. (Malfoys, Parkisons, Nott, etc)
James and lily were soulmates.
And Snape rejected his soulmate as he wanted lily instead of a Random Muggleborn. Snape started the bullying of James the Maureders just retaliated. But Snape tricked lily into thinking that her soulmate and his friends bullied him for no reason.
Snape joined the death eaters As voldermort promised to kill James and make lily His soulmate instead.
When Harry was born His parents tried to find A Hermione Jean Granger, But couldn't find any Wizard family with the surname Granger who have a daughter named Hermione.
So they realised that Harry's soulmate will be a Muggleborn just like them selves.
The attack happens And Dumbledore uses a powerful Spell to hide Harry's soulmark from everyone including harry himself. And it will last until Harry's eleventh birthday.
When Harry turns eleven and gets the shock of his life when a giant man Knocks down the door and tells him that he is a wizard and his family were wizards and witches. Harry gets another shock when all if a sudden A tattoo of the words Hermione Jean Granger appears on his arm, when Harry asks Hagrid what is happening Hagrid explained (not that well) that it is a soulmark, And that the soulmark shows the full name of his soulmate, and that a soulmate is the perfect romantic partner for him.