Try to keep the things JKR has stated true, but if you have someone not as well defined, please use your imagination and have fun!
In plotting this out with Mooney I told her that I think Peter was an equal to the other three until Voldy got hold of him. That each Marauder has their strengths and weaknesses, but since he was sorted into Gryffindor he had to be brave and clever at some point. I really think we will discover that something traumatic "broke" him, maybe even some moral bind where he willingly traded himself for the good of another.. and now we all think of him as weak and dispicable... but, he had to start out Gryffindor-ish or he couldn't have been sorted as such. Anyhow, that's what I would do with him if I was writing for him...
So anything that hasn't been proclaimed by JKR is yours to play with!
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Yes, there will be a separate forum to put the teachers and Dumbledore, etc. into
QUOTE
3. If you pick a Marauder or someone who writes only to a Marauder, then please post your letters in the Marauder’s forum.
4. If you pick a character who does not write to the Marauders, then make sure you’ve got someone to write to and start up a new forum (I.e. a Dumbledore-Snape forum, etc.). This will help keep down rampant chaos.