The idealistic leader of the AEUG, who travels aboard the Argama during its initial tour of duty. Formerly a high-ranking officer in the Earth Federation Forces, Blex was outraged by the atrocities of the Titans, and used his political and business connections to organize a resistance group.

Spoiler

He is shot by a Titans operative in the hotel Dakar Prince and later dies in the arms of Quattro Bajeena, telling him to become the new leader of the Anti Earth Union Group.

(Source: The Gundam Wiki)