Im not the one who came up with it, but I cannot stress how much I love this idea about playable Ridley:
People think he would be awkward right? Well, what if that was actually implemented into his playstyle? Someone said that perhaps Ridley could be a character thats bad to use on the ground, but be highly mobile in the air. I agree with the idea so much, he would be the opposite of Sonic kinda (according to E for All impressions). Ridley would indeed be awkward on the ground, moving clumsily and his attacks being rather laggy (he hardly attacks from the ground), but get him into the air and he would be at least as mobile as Melee Jigglypuff, probably faster.
Equip him with fast and comboing aerials that would essentially make him a character that needs to stay in the air to be effective, and there you go. That would be a perfect capture of Ridley, since in his games he never stays on the ground for long. And that make for quite a unique character, if it was implemented purposefully. Sakurai could mention this in his trophy and everything. The idea of a Ridley who needs to fight like he does in the boss battles from Metroid is just perfect to me...
This makes soooo much sense
this is win