No but seriously, characters like Shadow, Silver, Blaze, even the Jet and Espio teams are now, like, left in the dark. I really don't like what sega did by creating sonic boom and the new designs. Are they really gonna continue with that? What could possibly be next if they do?
See, I think there's a slight difference here in regards to the Sonic games and characters.
In the main games, they reduced the cast because people kept bashed on "crappy Sonic characters." However, in spinoffs, most of these characters keep appearing left and right. The Babylon Rogues are basically restricted to Riders, but whenever the side characters appear, you always see Cream, Team Dark, Team Chaotix, Blaze, and Silver added as well, so they're not really left in the dust at all. They just don't appear in the "main" games.
The Mobile games prove they still plan to use those characters as well.
You mean the one he plays the biggest role in?
The series in general is over-saturated with throwaway characters. They seem to have the opposite mentality than that of Nintendo's: create the gameplay first, worry about the characters later. Most Sonic characters are created now just for the sake of existing.
It is a bit irritating that they tend to create a new character like a helper character per game rather than utilizing existing characters. Not all of the characters are "throwaway," though, but those characters are the only ones that appear in future titles, and since Sonic '06, no new "recurring" characters have been created.
The main characters that tend to be "recurring" characters are Shadow, Rouge, Blaze, Silver, Cream, and Team Chaotix. The latter less often. Then occasionally a spinoff utilizes Jet or Omega, and that's about it. Regardless, they've been creating characters far less since Sonic '06, usually only adding like one helper character that doesn't appear again. Generations didn't even add any, though Lost World added new (lame) antagonists.
Honestly, though, its just a trend with Sonic ever since Sonic 2. They added a new character per game. So its not like its anything new. DKC did it as well, starting off with five characters + Animal Buddies, and continuing the trend through DK64. It probably would've continued even more if Rare had not been bought out.