Adelard Dekker is a recurring character who has been known to provide occasional assistance to Gertrude Robinson.
Dekker is first mentioned in supplemental to MAG 77, where Gertrude Robinson references his description of NotThem in statement, #9910607 (contents of the statement unknown).
Around 2012, he helped Gertrude store a large amount of explosives, and in the note also provided a written statement which is featured in MAG 113. He mentions theorizing about an ascending new Entity, and looking into a possible manifestation. He discovers it to be an avatar of The End instead who kills people via dreams, and disables him via brain damage.
Dekker is described by Lawrence Moore as an old, thin, black man shorter than himself. He has short, gray hair and an imposing presence.