Most suspicious:
Hagrid
Voldemort

Quite suspicious:
Dumbledore
Remus Lupin

Slightly Suspicious:
Dobby
Luna Lovegood

Not suspicious:
Filch
Snape
Pettigrew

Just my opinion anyway, I only compiled this out of boredom, anyone agree with my list?

P.S Remember Pettigrew is Jester and will lose if we don't lynch him, so he really isn't a problem.