A recruit who can scream loudly enough to fly, once somebody pushes him off a satellite dish.
Sean Cassidy has a supersonic scream capable of shattering glass and propelling him into the air, and is a former member of the X-Men. Caleb Landry Jones plays him.
First Class is at its best in the middle, when it is about a group of teenagers finding out what they can do in a garden, and Banshee is the clearest example: the power is useless until somebody makes him jump.