It may just be a fever dream that I had when I was obsessed with this show, but for some reason I distinctly remember an episode or possibly two dealing with a (possibly young) character whose jutsu (I believe it was gen, but could be misremembering nin) was so incredibly strong they had to be separated from the rest of the world. I think their affluent family kept them...like...in a cabin or something? If anyone can confirm the existence or denial of such a person/episode/trait, it would be greatly appreciated.
While I'd love to be corrected, further investigation and plenty of googling frustrated me to the point that I started clicking random page multiple times. I think I may have been referring to Ranmaru's Kekkei Genkai (http://naruto.wikia.com/wiki/Ranmaru%27s_Kekkei_Genkai), but I would need to re-watch the episode in question to confirm.