Sayaka

Before I used to think Sayaka was the stupidest character for not confessing to Kamijo after Hitomi gave her the chance. Now that I look bad I understand why Sayaka didn't confess. The pain, regret and shame after finding out what becoming a magical girl truly meant and the changes it does to your body (soul gem incident). Despite this she still didn't regret using her wish for someone else. She was suffering so much already yet her one of most precious friends just steals the guy she liked under her nose without knowing what was going on with her and Madoka. I think the reason she didn't confess to Kamijo was because she felt so ashamed, and guilty that she didn't think she was worth Kamijo's time. Although I still think it was foolish of her to not use the grief seeds to clean her soul gem.