Since we'll be doing this on a thread, I think it allows us a little bit more freedom as far as 'characters' go.
I mean, technically we could write more than one in a thread, and bring others in and out if we so chose... I don't think we're necessarily limited to just one in a story, unless we so choose to do so.
I also have a new character idea I could run with, and I've somewhat modified my overall idea of Doneghan once again.
I say a little of both!
We can retcon things and restart, but use the same people if we so want, and work out backstory between them if we'd like.