Nice choices. I had to look up the last two!
This is probably a common choice, but my favorite character of the moment is 忍 (endure), and also 刃 (blade). Very 傳神, as a Taiwanese person might say.
My least favorites are the ones that are nearly impossible to write. 亞 and 惡 are tough enough, but 繩, 蠅, 釁, 龜, and 鬮 are just nasty. If you can read (or, crazier still, write) all of those without a dictionary, you get a gold star.
(I bet a lot of people have had to magnify their browser's font size on this thread.)