Guys...
Shokio is here!
0_o
Where? I want his autograph! We may not agree on everything (especially Ridley), but that man is one to be respected. He tells it straight.
Anywho, I've come to this realization about Ridley. Stick with me, people:
1) Ridley's size is a problem.
Sorry, fellow Ridley enthusiasts. The "too big" crew has a point. Ridley has to be substantially bigger than Samus (already one of the game's largest characters), but that's not really the core of the matter. The main problem is when you compound Ridley's size with his shape: Rildey's skinny and jointed body attached to those giant wings and snout make him difficult to design. The concept artists not only have to downsize him; they also have to make sure that all of his parts stay in proportion. The programmers have to make sure his animations are fluid, which is no easy task when he has so many joints and those giant wings.
Keep in mind that this is the worst possible entry for Ridley to join. I'm talking about the 3DS and Wii-U versions... it would be even more difficult to make such a complex character in TWO different systems. It would have been much easier to make him in the previous entries in the series, when only one game was made at a time.
Making Ridley playable is far more difficult than making any other conceivable character. K. Rool's rotund shape is easy to design and animate, Little Mac is a basic humanoid, Toad is simple and cartoony. I'd say that it with the time it would take to design and program Ridley, the developers could have made two simpler characters.
2) Problems can be solved. Ridley is worth the effort.
It would take a great amount of manpower to make Ridley satisfyingly playable. But it can be done if enough resources are put behind the idea. Charizard faces some of the same problems Ridley does (if on a lesser scale), and he's playable. Ice Climbers and Captain Olimar both took a great deal of work and the former wasn't even commonly requested or "important."
It basically boils down to this: would you rather have an awesome Ridley or two simpler but perhaps lovable characters?
I'd rather have Ridley. He's important and who DOESN'T want to play as a giant space dragon? Although I don't hold him in as high esteem as the most devoted of Ridley supporters (sorry guys; he is not so important that his lack of Melee playability is a crime), I fully acknowledge that he's one of the top five most important Nintendo characters left. His inclusion would please a great deal of people and he's too awesome not to attract the kiddies.
At this point, when we're seriously considering Waluigi and one-off characters as playable (not a bad thing), Ridley stands out as a diamond in the rough. I'm not going to ragequit and bail on the game if he's not playable, but it would be a real shame to let him fly this go round.