Not in chronological order. Also FF deleted my work so... anyway yeah. This is YEAR ONE!
The six (a blonde boy joined them during the second week of school) became known as The Avengers during the last moth of school after they pranked Draco "Enemy One" Malfoy with red and gold hair and the Gryffindor flag drawn onto his face.
Of course no one knew who The Avengers where.
No one knew it was the shy Bruce, the innocent Steve, the destructive Tony, the marks-man Clint, the "obnoxious" and loud Thor or the sweetly perfect Natasha who made up this group.
They became a "thing" because of a note Steve left.
Dear Git.. oh sorry Malfoy
We pranked you to avenge the Muggle-Born Hermione as you where picking on her.
We hope that you will not do so again and if you do well... you're gonna have a bad time.
Please think about your actions. ~ TA
The TA originally stood for Team Awesome but they all decided (most of them Tony wanted it to stay the same) to take the name The Avengers as it represented what they stood for.
The new spread fast. Almost as fast as the news that Scar (Harry) had defeated Noseless-Clot-pole... again.
They didn't mind, in-fact this was what they wanted.