I love you all to death (Just so I can smash bros with you) (SSBWiiU/3DS)

[FinalSmash]

Potential Yoshi series fighters:
Shy Guy - I would play him to death if he'd be playable. I can imagine all sorts of Shy Guy subspecies and gadgets involved in his moveset. Final Smash: Shy Squad!
Baby Mario - His moveset includes crying and sit inside a bubble. That's it. I doubt he can even walk.
Raphael the Raven - Electro ball stomp and anger issues. Final Smash: Something moon related.
Baby Bowser - Ha ha ha! Never gonna happen. Bowser Jr. is likely to take the stage as a Mario-series character, with maybe a Baby Bowser costume. If his Final Smash is Big Bad Baby Bowser, I'll shit bricks.
But what they all have in common are that it's very unlikely for them to be added to the roster. I do think a Poochie AT is not out of the question.

You're forgetting Kamek.

Kamek would most likely be a boss, along with Kammy.