User blog comment:Athena jackson/ADHD/Dyslexia/@comment-4016314-20110614122352/@comment-4016314-20110615134401

and on this wiki it stands on the ADHD page that most demigods have ADHD and is usually coupled with dyslexia. so i think that means that you don't need to have any of them to be a demigod, but it is normal to have at least one of them.