Re: Want to change Stroud to Alistair
@Fenrispro8 You have to set it so Loghain dies at the Landsmeet, Alistair doesn't become King, and either the Warden dies or Morrigan has a baby so nobody dies at the end of DAO. If Morrigan does not have a child and you want Alistair to be the Warden in DAI, your DAO Warden must sacrifice themselves with the Archdemon. There is no way to have Alistair and the Warden alive without Morrigan having a son.
You also can't change the world state once you've started your playthrough. There are some hints in Haven about what happened in the first two games, so you might be able to tell from there whether some of your changes happened (the quartermaster, for example, is a fan of Loghain, and Varric can tell you some things about Hawke and their companions).