Mythos
About
Mythos appears to be very calm and collected in most situations and is usually seen smiling.
His real name is Tomohisa. When he was a young boy, he was a member of a cult. His parents led the cult in a mass suicide. Due to the infamy of the incident, Mythos's sister moved abroad, but he was not allowed to follow her. Feeling trapped by a society which failed him, he founded Logos, seeking to bend Japan to his own will.
(Source: Active Raid Wikia, edited)