By Dana Mathews
Despite being the oldest band member at 21, he no longer thinks of himself as the one who looks after the younger guys.
"At first, straight off 'The X-Factor,' I did think of myself as the oldest. But to be honest, I don't think I'm the best role model in the world. I'm pretty immature sometimes. I don't think I fill that role well," says Louis.
He likes to write music with Liam.
"On our second album, we wrote the music together as a band. On the third record, we've kind of broken up into our little camps of who we work well with, and I work well with Liam. Liam and I have written 10 or 12 tracks and hopefully nine or 10 of them will be used. It's great to have a lot more involvement and control."
He loves to get into mischief!
According to Morgan Spurlock, director of "This Is Us," "I've seen Louis climb over all kinds of things over the course of filming This Is Us. He likes to have a lark."
He stocks his fridge with Dr. Pepper.
Our senior entertainment editor Dana Mathews (who wrote the cover story!) overheard him declare his love of the soda during the soundcheck at their Miami show.
He values a girl with a sense of humor.
"I like someone who doesn't take life too seriously. I hate people who are a bit uptight."
More stories from Teen Vogue: