Harry
Honestly? Considering Sherlock is more than likely a demon and killing people for no other reason than to torment him, Bo nearly died, his so-called best friend isn't even Sherlock at all, Katherine's up to her usual bullshit, and to top it all off Moriarty's back in town?
He's doing pretty well, actually. More angry than anything. Let him come. He deserves to help take this thing down.