Who is Avenged leader?

There is no "Avenged leader". The Avengers is a fictional superhero team appearing in American comic books published by Marvel Comics. The team was created by writer Stan Lee and artist Jack Kirby, and first appeared in The Avengers #1 (September 1963). The team's roster has changed many times over the years, but the core members are Captain America, Iron Man, Thor, and the Hulk. The team is led by Captain America, who is the first and longest-serving leader of the Avengers.