Well, I don't really know the specific'steal my girl story' you're referring to. It could be about a guy who feels like another person is trying to take his girlfriend away, perhaps through flirting or being overly friendly. Maybe there was a situation at a party where a new acquaintance was getting a bit too close to his girl.
The perfect girl could also be someone who has a positive and kind personality. Just like how One Direction spreads positive vibes through their music, she would be the one who brightens up the room with her smile and is always there to support her friends and family. In a story about her, she'd be the hero who saves the day with her kindness. For example, she might volunteer at a local shelter, showing her big heart.
Jealousy is a key element. When someone feels like another person is after their girl, jealousy kicks in. Also, the actions of the person trying to'steal' are important, like flirting or getting too close.
She should be adventurous. Picture a story where a girl goes on a journey to attend every One Direction concert she can. She travels to different cities, meets new people along the way who are also fans. This adventurous spirit makes her a perfect girl in the One Direction world because she's willing to go to great lengths for her love of the band.
Friendship is another key theme. The girl might form a deep friendship with the band members. This could involve things like helping them through tough times in their careers or just having a great time together. In some fanfictions, the friendship then evolves into something more romantic.
One common theme is romance. Combining the love - interest aspects of One Direction's popularity and the romantic drama of Gossip Girl. For example, a member of One Direction might fall in love with a Gossip Girl character.