Chloe Bennet I'd love to see as a close friend, almost best friend. She would have been married/engaged/dating one of his best buddies from the Navy. The three of them were very close, and when his buddy was killed overseas (something Michael blamed himself for, for a long time) he became incredibly protective of her. This would be a platonic line, but I'd love to build a strong, solid friendship.
Jon Bernthal is a little less specific. He'd basically be his current NYPD partner and a good friend.