The following are some of the more pain in the arse Chinese characters for me to master:
The Chinese character(s) - the pinyin pronunciation and tone - the English meaning
警察 － jing3cha2 - police or police officer
赢 - ying2 - to win
锻炼 - duan4lian4 - to exercise
魅力 - mei4li - charm
糟糕 - zao1gao1 - awful
整理 - zheng3li3 - to order/arrange
嘴 - zui3 - mouth
擅长 － shan4chang2 - to be good/skilled at x
Depending on what day you ask me, I should theoretically be able to write all of these off the top of my head. They're all currently in my SuperMemo regime.
Yes, I am insane.