We know Bud is back for a time so what other characters may be in play to end the series? I.E. Elizabeth (to turn Sean around), Josh as a Grimm? See how well we might guess? Those are my two.
Those two characters will be fine.Now I can not think of another,because I would prefer it to continue and that were not just two appearances in a single chapter.
I am wondering if they will bring back Trubel for the final episode. After episode two she is not credited. They might bring Elizabeth back. I also have this feeling we will see meisner again in some form. Dampen has been around the group off screen. Maybe he will be the Frankenstein character