riddler

from The Collaborative International Dictionary of English v.0.48

Riddler \Rid"dler\ (r[i^]d"dl[i^]), n.
   One who riddles (grain, sand, etc.).
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Riddler \Rid"dler\, n.
   One who speaks in, or propounds, riddles.
   [1913 Webster]

   {The Riddler} [Capitalized] A fictional character in the
      Batman comic books series and also in the Batman series of
      movies. He was an enemy of Batman who proposed riddles.
      [PJC]