He's a new character. Since he seems to be an uchiha who knows itachi I think he's another uchiha that itachi let live. Itachi said he didn't kill sasuke because he was just a kid who didn't know about the coup but unless sasuke was the only uchiha brat walking around there had to be others. After dealing or before dealing with sasuke itachi helped several children escape one of those children is now grown up with his own child shin.
Just thought it'd be nice for a theory about this guy that doesn't involve shisui for once. Also just throwing ideas out there.
Just thought it'd be nice for a theory about this guy that doesn't involve shisui for once. Also just throwing ideas out there.