Board Thread:Naruto Discussions/@comment-36755597-20180829215104/@comment-25607614-20180925233330

OP: It really wouldn't be the Sharingan or Sharingan-like at all, at that point. Sharingan watches someone's body to precisely mimic what they can do. It doesn't even give them access to elements they don't have normally.

It'd be much more like that kinjutsu that was used in one of the Naruto movies where the villain would steal bloodlines and incorporate them into himself.

General: Elemental natures are not explained very well in the series, and the creation of new "Kekkei" terms doesn't help. We know that anyone can learn any chakra nature, as Shikamaru taught everyone in the Fourth war the basics of Earth release in a matter of moments. We also know that you can learn to combine two elemental natures into a more advanced element, as it is stated that the third Kazekage learned to do this by watching Shukaku.

We also know that all of the third Kazekage's descendents were born with the Magnet Release kekkei genkai. I would infer from this that advanced chakra natures are treated as bloodlines because they are inherited genetically (just like any chakra nature; ex; Uchiha and fire), but that doesn't mean that they cannot be created by those who possess the proper base elemental affinities.