The fact that Sega is prepared to cross off more than five characters suggests that very few of the characters will be left at the end, and many of the characters are inconsequential NPCs in other games anyway. Our guess? The publisher is playfully referring to the near-universal hatred of the extended Sonic cast, to contrast the surprise reveal that Needlemouse has only one playable character.
And that character will be Froggy, the frog Big the Cat attempted to catch with a fishing pole in Sonic Adventure. Another guess can be seen after the break.