A man/woman after your own heart
Definition 1 of 1
Pro Tip 1/3Shared Passion
Use when you're impressed by someone's similar interests or hobbies. 
She collects vintage records as well—truly a woman after my own heart.
Pro Tip 2/3Positive Connotation
The phrase suggests admiration or a connection; it has a warm, positive feel. 
He's always volunteering to help others, a man after my own heart.
Pro Tip 3/3Not Romantic
The phrase isn't necessarily romantic. It can be used for friends or people you admire. 
My professor, advocating for climate action, is truly a woman after my own heart.