|Relatives||Hiroshi Sakurai (father)|
Chiharu Sakurai (mother)
Osamu Sakurai (grandfather)
Junko Sakurai (grandmother)
Kana Sakurai (aunt)
Nao Sakurai (uncle)
Akio Sakurai (uncle)
Hisako Sakurai (aunt)
Kiyoshi Sakurai (uncle)
Mizuki Sakurai (aunt; deceased)
Chihiro Sakurai (cousin)
Aika Sakurai (cousin)
Kohaku Sakurai (cousin)
Hitomi Sakurai (cousin)
Yoshito Sakurai (cousin)
Hotaru Sakurai (cousin)
Shiki Sakurai (cousin)
Shiori Sakurai (cousin)
Rika Sakurai (cousin)
Kaoru Sakurai (first cousin once removed)(alternate timeline)
Kaori Sakurai (first cousin once removed)(alternate timeline)
|Voice Actor||Josh Keathon|
|First Appearance||The Rise of The Carnage|
Masumi Sakurai is a Shinobian/Human hybrid who has been corrupted by the Shinobian dark technique, blood control. He is also the son of Hiroshi Sakurai and Chiharu Sakurai, the nephew of Kiyoshi Sakurai, Kana Sakurai, Akio Sakurai and their spouses and the cousin of Shiori, Shiki, Rika Sakurai and Akio's children. He is also a member of The Carnage.
Masumi has pale skin, medium-length black hair and dark brown eyes. He usually wears a dark sweater with two red streaks on the arm on the left with an untucked white shirt underneath, blue pants and black shoes. During his time in the boarding school, he wore a maroon blazer over a white dress shirt with a black necktie, and gray pants.
Masumi is usually seen with a stoic face. He is cunning, clever, cruel, sadistic and manipulative. He has herrited his malevolent nature from his father, Hiroshi Sakurai.
- Masumi is the first Shinobian who has short hair, as Shiki, Kiyoshi and Hiroshi, have long hair (although Shiki, Kiyoshi and Hiroshi have short hair in Human form).