Liam:
Liam goes as his inner self, Leroy and you go as Liam. You two wanted the two, to be twins so Liam planned this out.
Louis:
You and Louis go as tv characters. He goes as Corey Mathews and you go as Riley Mathews. (Boy Meets World and Girl Meets World.)
Niall:
You guys decided to coordinate on something after arguing for hours. You are gonna be a sexy cop and he's the prisoner. When the lads ask why he's the one in the suit, you say it's because he ate the last brownie.
Harry:
Bonnie and Clyde because you two are the two are like them.