In this sense pretty much everything. I haven't done any form of cosplay in a long time, but when I did I remember saying and doing things on a whim, especially when people wanted a picture/took pictures with me. It's a little embarrassing, but also enjoyable. Just fun to get into a persona as well. Oh and to add, have only done Lolita fashion; character cosplay is something I can't wait to tackle!
I'll probably say some cute catch phrases or act like the characters I cosplay as in the near future when I decide on who I want to be.