Yes, I might have it both can be because the two would be remarkably interesting XD
I'll have to do a cheap cop out though, with Corvo doing something that couldn't realistically happen like using his past interactions with Granny Rags to convince her to let him go just this once or (This option preferably), Corvo either saves Slackjaw leaving Granny Rags alive somehow...
I don't know, they're interesting characters though and if I do only choose one it'll be because someone chose to RP one character and no one chose the other. If people join they can RP up to three characters, and one of the three can be their own character.
But if they choose more than one of their own created character only one can be given the outsiders mark. I don't even think anyone will join
I know of only one person who has confirmed they will.
I think it'd be really interesting if multiple people joined though!