What three characters would you choose to go to the past to make Azeroth a better place.

The objective of this is to lessen and prevent catastrophic events that befell Azeroth for example the scourge. I know this would be creating a new timeline technically but lets say this changes the main timeline instead. Rules for this scenario is each character gets to time travel three times before they are returned into the present. The characters can travel with each other if they want to help achieve each others goals. The characters would obvisously want the same present so they would have to have the same or atleast similar goals. Characters can only travel to Azeroth not other planets like Argus or Draenor. There is no time limit to the portals and only they can travel through it but the characters still age. Lastly everyones opinions of a better Azeroth are different, so there is no overarching goal but what you think what a better Azeroth would be.