User blog comment:Jojo-a-gogo/How many characters do you think are going to be in all-star battle?/@comment-5426991-20121029114752

Anything less than a 35 character roster would be disappointing. If the story mode going to cover the stories of Part I through VII, then anything short from 50+ characters means the whole story mode will be a disaster. Since CC2 said that the story mode will be "unconventional", and the the fact that the game is called "ALL-Star Battle" implies that the story mode might be an original one. In that case 35-40 character would be more than enough.