Lincoln/Peggy
I don't know much about what he's been up to or where he's been, but I know they've been trying to stop him. He's not a good person.
SHIELD's trying to do the right thing. They'd been trying to find others like me before they were captured by the ATCU - Advanced Threat Containment Unit, which turned out to be led by our favorite people all along. They're still trying to stand up to evil, but they can't be everywhere.