I'm sorry if I offended some of you who wants a Charles in Canada or Sadie in South America DLC, but I don't think it would work for RDR2. If it was a story like a book or something, then that would work, but as a DLC for a videogame? I don't think so.
As much as they are beloved by all, they wouldn't work as protagonists like Arthur or John. Sure, it is unfair to even compare Charles and Sadie as protagonists to John and Arthur. But still, they wouldn't work.
Charles was a very awesome character in RDR2. He is a silent and tough type who is a hunter. You don't think much about him at first, but when you get through him and talk to him, he is actually a good and kind person who kills when he has to and does bad things simply because he's an outlaw and they are on the run. He soon pretty much makes you love him when he shows his loyalty to you and Arthur and also John later on in the game. While he fits as a main character, he doesn't fit as a protagonist. He doesn't have the depth of character that John or Arthur does.
Same thing goes for Sadie as well. Sadie is a tough, ruthless and vengeful bounty hunter and gunslinger who stops at NOTHING to get her revenge. But you see that she's a good person who is in grief after her husband was brutally murdered. But is she playable protagonist material? No.
Again, I'm sorry. I love Charles, and while I have issues with Sadie, I still enjoy and like her. But they aren't fit or perfect to be protagonists.
I know that back then before RDR2 was released, everyone didn't like Arthur and thought he wouldn't even be better than John. And you know what happened after the game was released and you spent time with him in the game. But you see, Arthur was ALWAYS going to be the protagonist of the game, ever since the development of RDR2 began around 2011.
Don't @ me. I'm just stating my opinion. If you disagree, that's fine. I'm not going to enforce my opinion on you.