This Kekkei Genkai was displayed by the
Twin Brothers, Sakon and Ukon, members of
the Sound Five, an elite group of ninjas from
Otogakure that worked under Orochimaru's
orders. Sakon and Ukon's unnamed kekkei
genkai gives them the unique ability to break
their bodies down to a molecular level and, in
the process, merge them with another body,
generally that of their sibling. All Soma no
Kou bios are actually composed by 2 twin
brothers or sisters that share the same
ability. One of the twins resides within the
other, normally with only his head showing,
both while merged keeps control over his
body and can manifest some of his body
parts on the host's body. While merged they
do share physical pain and damage but keep
their chakra flows independent to some
extent. This enables them to be able to mold
chakra independently of eachother but also
makes it possible for them to not only injure
eachother but also take shared, equal
damage, from techniques