User blog comment:Fire Eater/What would you do different?/@comment-27249438-20180419092407

Have Sasha die to the titan she saved the child from.

Expand more on the Levi Squad in the first season, and have one of the members (Oruo or Petra) survive the Female Titan attack.

Mikasa kills Ymir when she betrays them at the end of season 2, (Jaws titan still goes to the same person that currently holds it in the manga)

Have Nanaba survives the battle of Utgard, she will die during (SPOILER) the battle of Shiganshina where Sasha got wounded by the thunderspears.

Erwin get the colossal titan. Armin dies.

I would also somehow make Marlowe survive.