Nine

Known as Nine, is one of two members of the Sphinx terrorist group. He grew up in an experimental institution for gifted children with Twelve, though the both of them managed to escape. Later on, both Nine and Twelve carry out several terroristic acts in Japan.

He is reserved, calm and collected, and very, very intelligent. Nine is efficient in many fields, up to exceptional computing and hacking. He's an impeccable strategist, with a knack for chess and classical literature. Good with disguises.

(Source: MyAnimeList)