I remember I've seen a smbx vid, a trailer or a teaser of some episode. There was a playable Rayman, but it seems like that project was abandoned, and I haven't found any other mentions of playable Rayman in smbx, so I decided to make my own gfx. These are based on GBC Rayman sprites and replace playable Link. It's not finished yet, but here are some examples of what it looks like.
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As I said, it's pretty raw, but I'll improve it sometime.