Going a bit off topic, but I think they really need to change the fact that new players only get Shaggy to start with. I think having a proper starting set of 4 characters, one from each class, would go a long way in actually easing new players in.
So, something like Shaggy, Bugs, Finn and Wonder Woman as your core four, then take a page from some gacha games and actually just hand you enough fighter currency to get one additional character (your starting "free pull" as it were).
If they don't want people immediately picking Joker or Jason, or any other newly releasing characters just make the bonus pick come from a specific pool of characters. Then maybe they can start adding to that pool over time as well.
Or ideally make the characters free and just charge for cosmetics and battle passes, but I know that's not happening.