Loki gets a chance to change everything. The Norns, having become tired of Odin's meddling in the Weave, have decided enough is enough. Death sees this as a chance to plead their case, asking for Loki to go through the trials needed to become the Master of Death. In order to stop Thanos, Loki would agree to anything, knowing what is coming, and so he does.
Hari Potter was a quiet girl, though everyone seemed to intentionally forget the 'girl' part. Uncle Vernon and Aunt Petunia called her 'boy' all the time, and Dudley too. All it seemed to take was baggy clothes, and none of the neighbors noticed. What if people continued to 'not notice? What if the castle of Hogwarts went along with it? How long could it continue?