I'm going to look at our situation from a different angle. Since we obviously have some fake name/roleclaims out there, let's ask ourselves what makes a good fake roleclaim?
In my opinion, it has to be simple, believable and most importantly it has to return no verifiable results (ie. your fake actions had no visible impact on the game). A good example from past games would be the "Apprentice Knight" from the fantasy game, it was simple (a backup for the knight), believable and he could easily say "I failed the killed the dragon last night" without anyone questionning him.
So from the four most suspicious people to me :
nen-suer:
Simple: Yes
Believable: Yes and no. Yes, because in regular games siblings can't do much more than talk to each other. No because of the setting of this game in which such a small role feels odd.
No verifiable results: His action being talking to his sister, this has no repercussion on the game.
Vetteman:
Simple: Yes
Believable: Protector (doctor) is one of the most common roles, there's the issue of how it fits the character but sadly I don't have the knowledge to judge that.
No verifiable results: It's impossible for us the say if his targets were really protected so no verifiable results here.
j0:
Simple: Yes
Believable: Yes helping others power up seems like a genuine role. Again there's how it fits the character to consider.
No verifiable results: His only alive target is hatmoza and he targetted him on Night 3, my guess is that hatmoza was fully powered by then.... but I'll let hatmoza answer that part.
zark:
Simple: Yes
Believable: Tracker is a fairly common role.
No verifiable results: He did produce some results which makes me think he's not scum.
P.S.: I have read the last few posts, I'll try to factor the new events in my next post. I'll post before I go to work if I have time or later in the day when I'm on a break.