Board Thread:Ask the Staff/@comment-39648545-20200109055943/@comment-33001101-20200109072030

It's a work in progress as the series is not over, who knows if there will be new characters coming ¯\_(ツ)_/¯. It does feature characters that have yet to appear like you said, characters like Spinel and the Diamonds, which only appeared in the opening.

Think this thread is in the wrong board as it's a question anyone can answer and the Crewniverse rarely look at wikia or have accounts.