Makumori Shichibi

Shichibi is one of the "bijuu", a tailed beast of the ancient world. The Shichibi was housed inside an unnamed kunoichi.
Shichibi and his Jinchuuriki were captured by Akatsuki. Akatsuki then removed Rokubi from the woman's body, killing the host.

Rokubi Raijuu

Rokubi is one of the "bijuu", a tailed beast of the ancient world. The Rokubi was housed inside an unnamed ninja.
Rokubi and his Jinchuuriki were captured by Akatsuki. Akatsuki then removed Rokubi from the man's body, killing the host.

Gobi Hoko

Gobi is one of the "bijuu", a tailed beast of the ancient world. The Gobi was housed inside an unnamed Rock Village ninja.

Yonbi Sokou

Yonbi is one of the "bijuu", a tailed beast of the ancient world. The Yonbi was housed inside Roushi, a wandering ninja. It is unknown what animal this bijuu was. Roushi used the Yonbi to create Youton, the Lava Element, a fushion of Earth and Fire Elements.

Sanbi Genbu

Sanbi is one of the "bijuu", a tailed beast of the ancient world. Seeking a way to create a ninja with a large amount of chakra that would be an unstoppable machine, the demons were placed inside shinobi. At some point in the past, it was housed within a ninja from Hidden Mist.