I can understand having a small main cast for the games; but the same doesn't really work for comics. (Unless it's something daily like Garfield) You have to have a pretty big cast in order to churn out story-driven content without it being noticeably redundant in nature. (The Sonic game series has expanded so much at this point, I don't see why they wouldn't start off a bit small while slowing adding and putting things into place before having original content sets off)
Exactly, and since the comics come out every month, you need to rotate that gigantic cast in and out on a consistent basis so that,like you said, it doesn’t get too redundant. Sonic does kind of have the cast for that, but there is another problem: Sega doesn’t let the characters develop
Now, I get why they’re like this. I understand not wanting to let the characters stray too far from the source material, I get that. It’s just that even with a decent sized cast, if none of the them can grow or develop or even learn from their experiences, things will get stale really fast. Mega Man managed to get away with having less original characters than the Sonic comics because characters like Rock and Blues were allowed to go through character arcs. In fact, all the Robot master were given a surprising amount of leeway in how they were able to develop. Now of course OCs were added, but notice how there weren’t as many. The only OCs were really got were a doctor, her robot, and a new group of villains, and that’s because classic Mega Man really only has a handful of villains to choose from, even including spin off stuff (In fact the only 2 other legitimate villain come from other material)
Anyways, point is, in order for things to not get stale, even if you ignore continuity, you need to either let the cast develop, or have original characters.