I have never seen the movement of a camel or cardinal. I am the one who came up with the idea of adding an 'archer' to the game of chess after seeing a movie which had a depiction of the battle of Agincourt where the use of the longbow made knights in armour obsolete. In trying to figure out how the archer would move, I realised that all the major pieces had complimentary pieces with respect to movement. The king moves in all directions, but one space at a time. The queen moves in all directions as far as she wants. The rook moves as far as he wants but only on the parallel and perpendicular. The bishop moves as far as he wants but only on the diagonal.
The one piece who's movement is unique is the knight, but he only moves on the parallel and the perpendicular. As a companion piece, the 'archer' moves in the exact pattern as the knight but in a diagonal direction.