The Northmen will also be more inclined to assassinations and plots than they would be in canon, and it's perfectly possible to have Ned Stark or other characters engaging in tyrannous behaviour under AI control.
With some luck, you can even turn them into genuine heroes. it's perfectly possible to have the two and others turn out to be relatively decent people. Through careful education, avoidance of the crueler decisions, etc. Alternatively, Aegon can forgo going after Westeros and attempt to forge a new empire in Essos but. He doesn't even have to lose Rhaenys and her dragon.
