User blog comment:ChibiDialga/Nintendo Direct/@comment-5174888-20150402222511/@comment-32500188-20150402231617

More than likely the chances will be greater if it's from a Nintendo-based game or some other third-party franchise that has games featured on Nintendo consoles/handhelds, and on top of the Project Diva series being made by Sega, they already have Sonic repping that part, so chances seem kind of slim. (I see it's important noting there's only one playable third-party-owned character per repped company here, and no one is quite sure how much Nintendo is willing to override that pattern as of yet, even if popularity overrules it.)

I probably wouldn't mind seeing her as a collection trophy, though... but I really don't see her or any of the other VOCALOIDs as a fighter in SSB. Even far less than me ever believing that the Pokemon Trainer, Animal Crossing Villager, and Wii Fit Trainer would ever become fighters. (Ironically, during my yesteryears, I voted for one of the three in a similar ballot before Brawl was ever announced... imagine my surprise to see it come to be, yet not how I imagined exactly... but I digress.)