Who the hell is Bucky?

Are you aware the shape I’m in
My hands they shake my head it spins
Ah Brooklyn Brooklyn take me in
The wand chooses the wizard, Mr. Potter. It’s not always clear why. But I think it is clear that we can expect great things from you. After all, He-Who-Must-Not-Be-Named did great things. Terrible! Yes. But great.
‘cause we are the same.
Sherlock Screencaps 57-58
Sherlock 2x2
Ministry has fallen. Minister of Magic is dead. They are coming. They are coming…