I was thinking of that too...

Hermione would probably signify Lupin, Harry might be James and Ron is Sirius but they were definitely much nicer than James and Sirius. I do think the Marauders' are mean sometime.

In the series.. everything relates to everything. So if we were to point out every single thing that comes to mind, I think the result would be the 6th and 7th book. Where everything and I mean everything gets explained.