Things Hermione Did Between Deathly Hallows And Cursed Child. Of the three main characters in the Harry Potter universe, Hermione has to be the most important. Yes, Harry's the actual protagonist, but without Hermione, he would've died in The Philosopher's Stone itself.
When they return to the future, Scorpius can't find Albus and is informed by Headmistress Umbridge that Harry Potter was killed during a failed coup on the school at the Battle of Hogwarts; Albus does not exits. Scorpius goes to Severus Snape, who in this narrative is still alive, to ask for help.