I don't think so, since Ridley is not the right size to become a playable character, and also consider the fact Ridley is already a boss in the game.
While Ridley isn't actually in Metroid Fusion, an X-parasite that has copied the body and abilities of Ridley is seen in the game. Ridley was captured by the GFS and was being studied when the X escaped on the B.S.L. space station and killed most of the living things on the station, including Ridley.
Samus and Ridley are the only two who consistently appear in every game (except for Metroid Fusion. That Ridley was actually an X-Parasite).
Arnold Ridley's birth name is William Arnold Ridley.
Lin Ridley's birth name is Linward C. Ridley.
Read Ridley's birth name is Read W. Ridley.
Walter Ridley's birth name is Walter John Ridley.
The definition of the word 'Ridley' is A small turtle from tropical seas. There are two separate species of Ridley Sea Turtles, Kemp's Ridley Sea Turtle and the Olive Ridley Sea Turtle.
Ridley is the wierd flying dragon named Ridley X in Metroid Fusion.
Ridley Tsui's birth name is Ridley Tsui Po-Wah.
The 2000 movie Gladiator was directed by Ridley Scott.
The cast of The Ridley Project - 2010 includes: Brian Flint as Dr. Robert Ridley Kirk Gostkowski as Jake Ridley