Kaiju

Kaiju (怪獣 kaijū?) is a Japanese word that literally translates to "strange creature". However, the word kaiju has been translated and defined in English as "monster". Specifically, it is used to refer to a genre of tokusatsu entertainment. Kaiju films usually showcase monsters of any form attacking a major Japanese city or engaging another (or multiple) monsters in battle.

Biology
Kaiju are typically modeled after conventional animals, insects or mythological creatures; however, there are more exotic examples.

List of Kaiju being sealed within Humans and Hylians

 * Yamata no Orochi (Sealed within Paul Gekko)
 * Isomaru (Sealed within Lyn Nohora
 * Yonbi of Metool (Sealed within Kaboomer