Cho Chang's posse

"Why do they have to travel in packs?"

- Harry Potter

Cho Chang's posse was a group of Ravenclaw girls which included Marietta Edgecombe and possibly Katie Bell and Romilda Vane. They all gravitated to Cho because of her beauty and popularity, and even followed her into the bathroom.

Behind the scenes

 * Every single identified member of Cho's posse, confirmed or speculated, is a member of Dumbledore's Army.