As noted by now in practically every tour book in every language on Japan, Harajuku on Sundays is home to all sorts of colorfully-dressed characters, from people giving away free hugs to Emos to people cosplaying Pikachus--and the colorful tourists with expensive camera(s) clicking away whilst chatting and pointing and giggling.
Yeah--compared with when I first arrived in Japan, Harajuku's become something of a people zoo. The interesting thing for me is how annoyed tourists become when I take photos of them taking photos of everyone else; I suppose it comes from our different frames of mind. (I firmly believe that if you are engaging in photography of people in public, you're tacitly giving permission for others to do likewise. How easy it is for us to forget that when we're on the other side of the lens...)