Board Thread:Theories and Speculation/@comment-26704954-20150821182356/@comment-4912646-20150821230338

In a way, Kaguya was sealed into Obito and Madara, and the latter ultimately took on her form once the right circumstances were met. Obviously Kaguya isn't quite human (and was in beast form at the time of her sealing) but it proves that it is possible to seal living beings that aren't entirely made of chakra into other people.

As for whether anything special would happen if a human was sealed in another human, who knows? Orochimaru's soul apparently grants some of his abilities to its host bodies, but once again he's quite a special case.