Watashi is a generally polite or formal form of referring to oneself (the more formal being watakushi, which I think Euphie uses?). It's more appropriate language to be used by someone who leads an organized group unless said person is very deliberately devil-may-care or rude/rough (see Tamaki) or informal. Old-fashioned types like the leaders of the Japan Liberation Front would use ware, I think. Correct me if I'm wrong. :(
(no subject)