Board Thread:Wiki Discussions/@comment-5108618-20141014185139/@comment-1512913-20141018153354

Strongest evil person is without a doubt Kaguya, so that's definitely a no-no. For the ones suggested above, I think that: are too similar. Favorite jutsu is too broad of a category and favorite element&kekkei genkai are problematic, since advanced natures are kekkei genkai, too.
 * favorite element
 * favorite kekkei genkai
 * favorite jutsu