Owen Grady and OTA (multiples okay)
Owen hadn't been through the end of the world ordeal; he'd arrived shortly after the countdown ended and the clock went away. He'd heard about the black out, though, and more importantly he heard about the party in the park and decided to check it out.
He needed to get to know the people he lived with now, even though that was pretty much the last thing he wanted. he'd rather hole up in the apartment, or better yet build himself a bungalow in the woods where no one would bother him. But he realised that wasn't practical, and he was better off getting to know at least one of his neighbors in captivity.
Plus there was food. Lots of it. Free food was always an acceptable reason to attempt to be social.