The Mastermind is Junko Enoshima.
I mean, come on. She's always been the mastermind.- Or it could be one of the dead students.
Ted is a prototype of Monokuma.
It has been shown that he can move on his own, indicating he is a robot of some kind and the way he runs his mouth is similar to that of the monochromatic bear himself. Nicolas
will be remain in the afterlife forever.He's unwilling to remain dead, despite being told the impossibility of his plan. And he also doesn't want to move on as well. Nicolas is probably going to end up in the afterlife forever, trapped by a dream that will never happen.