Question: is amaterasu a kekkei genkai?
Answer: Amaterasu is a Ninjutsu unique to some of those who possess the Kekkei Genkai Dōjutsu: Sharingan, after awakening the Mangekyō Sharingan. Amaterasu is a black flame that is shot out of the eye onto a target. The fire will then proceed to burn for seven days and seven nights and are otherwise inextinguishable.