Tony
The kid had no idea who they were. It was unbelievable that this kid didn't know who they were. He stood up, ready to march into the next room to dazzle the kid with a full Avengers get up, try and shake loose knowledge of who they were. But just then Steve stood up, gesturing the kid to follow him. The other Avengers left to room, heading for the conference room where Fury waited as he 'd been watching the interrogation remotely.
Tony followed his friends into the glass cage, settling around the round table. He took his place, sitting down next to Banner. Steve lead the teen into the room a few seconds after they'd all sat down.
"Percy, I'd like you to meet the Avengers." He waved at the room where Tony sat. The kid just looked bored.
"Hi."