Yes I know about the leaked roster thing and all that, but this is proof that at least these 3 are in.
in that video, if you look in the lower right it shows ness and jigglypuff icons at about 4:20-4:21
in that video it explains it and shows it more accurately
now the lower right icons are the icons for the people the sticker affects. So it can't affect those people unless they're....playable.