Clint
Every jaw around the table dropped. Trainee? Was Fury serious? None of them wanted to babysit some pyro bomb happy kid with a terrible attitude while trying to protect the world. The only person not shocked into silence was the kid and Fury.
"Why?" The kid asked calmly.
"For one thing, you're the only one with a working voice box in this room," Fury said dryly, but the kid shook his head almost immediately.
"No, not why you want me. I know what I'm capable of. Why should I bother?" The kid asked. Now even Fury was shocked into silence. The kid waited a beat, as if expecting a response. The room was silent.
"I'm going to go with no." He rose to leave.
As soon as Percy turned around to walk away, the whole room came back to life. It started with Tony bellowing WHAT and Steve snagging the kid's arm again. Fury was shouting over Banner and Natasha about how it wasn't babysitting, while Clint just worked his jaw tightly.
He has children, and while none of them were quite Percy's age yet, he knew he had agreed to be in the Avengers to prevent children, like his own or like Percy, from having face the dangers of their world. To protect them.
To stop them from having to be the ones forced to face them.
Suddenly there was a loud crash as Steve's body slammed into the table. Everyone went quiet, staring wide-eyed at the teenager who had judo flipped the Captain.
"Stop." Fury ordered, his voice dangerously angry. The kid wisely stopped in the doorway.
"I don't want to be a trainee or an Avenger or whatever. Go pick some other poor sap with a real rap sheet. I have places to be." He flicked his hand dismissively over his shoulder as he walked away.