Marvel's new generation of heroes has gotten more than a little crowded. Some old hands are still around, but the franchise is preparing to launch several new teams alongside The Avengers. The Avengers had two de facto leaders, Captain America and Iron Man. Their influence pushed Earth's Mightiest Heroes, sometimes in opposing directions. With Echo, Marvel could have a new, unexpected central character. She won't lead the new team, but she could lead the franchise by example.