I originally posté this as Kieran, at RPG-D and at my own Harry Potter RPG's forum. But I thought this would be useful for Harry Potter fanfiction writers in general as well.

There are countless ways toi can perfeclly easily bring a muggle main character into any Harry Potter story ou RPG & have a whole world of possibilities open for it - even if they don't know ou never learn about magic's existence! They can know ou learn, of course. Just, they really don't need to in order to be endlessly and colourfully written to a muggle's full potential.

If interested in how I connected my muggle...