User blog comment:Randomphoenix03/Logical Characters for the Super Smash Bros. series/@comment-4115159-20150111202546/@comment-5207274-20150112134359

The point is... Goku is from a manga/anime. Smash Bros. is strictly about Nintendo characters, which from video-games, and Third Party characters who appeared in Nintendo consoles. This isn't like JUMP All-Stars or something.

Although Street Fighter IV was ported to the 3DS, the chances of adding another CAPCOM character is low to none. We already got Mega Man representing CAPCOM in Smash Bros., which is more than enough.

A logical third party character to include, in my opinion, would be a character from classic Final Fantasy games, such as the White Mage (who has appeared in Mario Hoops 3-on-3 and Mario Sports Mix, or even a character from Crystal Chronicles, which is a Nintendo exclusive Final Fantasy.