Is kekkei genkai a real word?

Is kekkei genkai a real word?

Kekkei genkai - meaning Blood limit. This term is used in the anime Naruto to describe the abilities used by a specific clan that can only be used by those born with specific blood line.

Is byakugan a kekkei genkai?

The Byakugan (白眼, lit. White Eye; Viz: All Seeing White Eye) is the dōjutsu kekkei genkai of the Hyūga and Ōtsutsuki clans. It is regarded as one of the "Three Great Dōjutsu", the others being the Sharingan and the Rinnegan.