Yūki

, is the birth name of the low-notorious terrorist that is entitled as. While the gender of this terrorist remains a mystery among its fellow peers of Sorane the masked creature is referred as "he" with a respectful honorfic for his position within the organization.

Although Shihakushi hasn't been seen to participate in the the more notorious activities of Sorane his position remains unquestioned among the members. Not because of his abnormal acquaintance with the leader of Sorane but the significant and threatening glimpse of crimson behind the holes of the mask – Shihakushi is presumed to be another that will threaten the.

More to come

Trivia

 * actually means "Messenger" instead of "Angel". I preferred to use a synonym that sounds better and suits the person behind the mask. You can also write it as.
 * Credits:
 * to David for helping me with naming the terrorist and providing me with the kanji and translations.
 * Databook: