Assist Trophy: Birdo

Birdo is certainly an important character in the Mario series. She was the primary boss in Super Mario Bros. 2, along with appearing in dozens of Super Mario Party, Mario Sports, and Mario Kart games. I would say that she's more deserving than Waluigi for becoming a character, but she's another character that still isn't quite there. Maybe if they remake Super Mario Bros. 2 or if she gets a starring role in an upcoming Mario game, then she would be far more deserving of a slot.

For her move as an assist trophy, I think she could shoot eggs like she did in Super Mario Bros. 2.

Assist Trophy: Waluigi

 I just don't think Waluigi should be a character until he has his own game, which isn't a bad idea. Waluigi's clearly a pretty popular character, and Nintendo is low on fresh franchises. Once he starts in a game or at least gets some possible moves, I'm all for Waluigi to be a character. Until that day, an assist trophy he should remain.

Stage: The Impact Site

I personally thought that the "Distant Planet" was a really stupid concept for a Pikmin stage. Why couldn't they have named it after one of the stages? I think that the Impact Site could be a very similar stage to the distant planet, with a few exceptions. One thing that could change would be that there would be something instead of a bulborb at the right. Maybe a wall that could be broken with enough damage or another piece of scenery. The ship in the background would still remain there.

Stage: Saffron City

We need this stage back for archive purposes. Saffron City was pretty simple, but was a really enjoyable stage.

Item: Teddy Bear

The teddy bear was an item in Earthbound you could buy. It would follow you around and take certain damage for you from enemies for around 200 health points. I think it would be an awesome addition as an item, because it's a unique concept.

Assist Trophy: Ivan

 

Ivan should be the final of the three assist trophies to appear in Smash Bros. 4. He could use his Earth PSI or his staff to attack enemies.

Trophy and Sticker: Balloon Fight Enemy

The only enemy in Balloon Fight that you can defeat. It is important enough in my opinion to be both a trophy and a sticker.

Sticker: Marcus McCloud

The son of the greatest mammal in all of Corneria, Marcus has never been seen in action, but should get a little bit of recognition. I'd say a sticker would do the trick.