Board Thread:Super Smash Bros. Discussion/@comment-14355010-20150106155005/@comment-24357950-20150413162808

Nightshade1712 wrote: DarKingdomHearts wrote: Ridley is already a stage hazard. I don't think stage hazard and AT's can be promoted to playable. If it was on-disc then it wouldn't matter but downloadable is a whole different story. (I love Ridley though, I wanted him in too)

You have to remember that Link is also in a stage, but he is still a playable character. Technically that's not the Link that is playable in the SSB roster, though. The playable Toon Link is from Windwaker. The Link in the train is from the subsequent generation.