Shayera Hol (Earth-43121)

"I'm a martyr on my home planet, and here I'm just the girl who betrayed the people she loved. I don't belong anywhere, but I'm still here. Why do you think that is, John? Trust me it's not because I think the League needs me. Yes, I still view myself as a valuable member of this team, but they were doing just fine without me. I'm still here because of you, John."

- Hawkgirl

Hawkgirl was a Thanagarian agent sent to Earth as a scout, but after betraying her people to save Earth, she became one of the Justice League's leading members.