Seen at THAT:

I for one was pleasantly surprised when Sheryl stopped being a haughty diva with a bad attitude and became a brave young lass. For a character that was never meant to be much more than Ranka’s older sister figure, Sheryl like the great Misa took on a life of her own and compelled Kawamori to make some changes after episode five.

Almost makes me want to watch Mac F.