Cole
When Cole came back from the wasteland, i found it so sad when he found out Piper was pregnant. Everyone there just ignores him completely and in the midst of him telling pheobe about a case he found she harshly tells him to go away and everyone is silent. I understand what they went through with Cole and how they feel about him is valid, but I just cant help but feel heartbroken for him in that moment.
It would have been great to turn him human around this time. But then again I'm not sure how that would necessarily work.