Kate Bishop and Castiel
"I am, yes. I have to have permission from the person first, then I can take possession of the body." He trailed off for a moment, his head tilting slightly. There were somethings Castiel hadn't come to terms with when it came to using a human as a vessel. Like the fact Jimmy Novak would no longer be alive if Castiel decided to abandon the vessel. He had been in possession of the body for too long.
He shook his head, "No. I'm not a Reaper, just an angel." He considered Kate's question for a moment. Considering what to tell her. "I can sense a person's presence. Like I can tell you where Dean Winchester or Shosanna Dreyfus or Adam Milligan are at this particular moment. I also know Balthazar is attempting to flirt with the server passing around the champagne."
He considered what else to tell her. "I can heal people. Also if you're in danger, all you have to do is pray to me -- or Balthazar -- and we can hear you, then come to you."