I’ll make a few predictions based on the trailer and the most formulaic movies of the past couple decades (at least).
Nerdy/not-nerdy white boy protagonist. Probably, neglected or misunderstood and teased for his interest in Minecraft
Smart-ass girl who is mean to boy but will eventually support and encourage him. Likely to have a deep knowledge of some subject that will play a critical roll.
Big, oafish man-child who lacks confidence but will learn he has value—probably through physical strength—that will save the team at some point.
Hero who has lost faith and confidence in himself and has given up the cause. Will have his faith restored by the children and find the strength to defeat or help the boy defeat the bad guy.
Edit: oh, snap I forgot:
sassy black woman who provides comic relief and, possibly, motherly care and/or wisdom. Potential to become romantically entangled with oaf or hero.