The best ending in Dragon Age: The Veilguard is the one where all but one member of your team survives, and no Faction leaders die. Davrin or Harding's death is unfortunately unavoidable, as whoever you pick to lead the second team during the 'Isle of the Gods' main quest will die later on, no matter what.

The Veilguard. They were the main characters of Dragon Age: Inquisition, and their previous choices impacted the narrative. This can help drive the motivations of Rook, Harding, and Varric as they begin their quest.

Dragon Age The Veilguard lets you create the Inquisitor, the previous game's protagonist alongside your main character, Rook. Besides being able to choose a new look for the Inquisitor, you can select three choices that determine the events of the third game.