Can the Rinne-Sharingan be transplanted or can it not because it comes from the forehead? Even if it could be transplanted would it have to be transplanted in the head?
The Rinne-Sharingan is a dōjutsu kekkei mōra (advanced branch of jutsu unique to Kaguya Ōtsutsuki and her direct bloodline). Rinne-Sharingan can't be transplanted onto non-Otsutsuki members, but there are ways to wield it, and the exact instructions are written on the Uchiha stone tablet:
- You need to have the Rinnegan in both eyes.
- You need to the Jinchuriki of Ten-Tails.
Madara Uchiha, as the Ten-Tails' Jinchūriki, was able to manifest this dōjutsu in his own forehead after regaining both of his Rinnegan. As a result of Black Zetsu's actions, Madara's body then served as a vessel to resurrect Kaguya.