Apperently, I read that Pluto is the leader of the outer senshi, as she is supposed to have said so in episode 171, though I have not got this far in the the series yet. however, in the manga, Minako really is leader of the four the senshi that protect the princess, or so i've read here: http://www.rahul.net/arromdee/sm.faq.4  17:10, 15/03/06