Trophy and Sticker: Bubble Monkey

A funny character and actually useful in your quest in Earthbound, the bubble monkey should definitely represent the series with an appearance as a trophy (hopefully blowing a bubble) and as a sticker.

Sticker: Merric

Fire Emblem should get a bigger representation of their characters, and I think Merric should be one. His appearance as a sticker would be a nice extra nod to the fanbase.

Trophy and Stickers: Orbulon

An important character in the WarioWare franchise, Orbulon deserves a trophy and at maybe even 2 stickers.

Trophy: Joshua

Giving Joshua a spot as a trophy would be okay in my books. He's not really that important to the franchise, but he's really cool. Maybe one day he could become an assist trophy.

Trophy and Sticker: Flying Man

I may believe that the flying men should never be a fighter, I think a little bit of action is necessary. Perhaps adding them as a trophy and sticker would be a fun little addition.

Item: Ice Flower

We all know there's the fire flower, but why not add the new ice flower? It could freeze opponents instead of burning them. A simple variation like this could spice up the typical fire flower.