It's me!!

apologies for any mistakes in advance, english is not my first language

At some point Sirius discovered a way to dark/shadow magic (he might have already had his circus by that point, doesn't matter) and desided to add it to his repertoire including himself as a star of the show. Loving the attention he would be getting on stage his gig was now both The ring master and The shadow tamer.

For a couple of years this was a big thing, but people did eventually start getting bored of it, so the tricks would get more risky and dangerous, it wasn't anything too dangerous for human beings, but the shadows were putting their lives on the line more often and it was pissing them off more and more each time. Till someshow, as part of the performance, Sirius actually ended up killing one of the guests shadow. It was surely very spectacular, but at that moment his fate was sealed.

Later somenight, he was trying to come up with a bigger way to make his act shine and in the process accidentaly released his own shadow from whatever dimentional barrier was holding it back. (like people are 3d and shadows are 2d) It attacked and in aome attempt to defend himself, Sirius knocked ower a candelabrum. That's how the fire started. In the end The shadow killed Sirius, celebrating it's freedom by escaping the island.

And the shadows danced until the eventually fire went out.

Years later it would return now posing itself as the ringmaster to break the barrier between two worlds, freeing other shadows and bring revenge upon all people, who visited aor have never even heard of the Starr sircus.

Hiding behind that mask is a full on shadow. You can see it by looking at his right hand (that he's usually covering with a cape) and by looking very close at it's neck.

All books and text on dark/shadow magic unfortunatlly burned in the fire years ago and Sirius can not free the shadows. For now.

Is lefthanded

Taller than original Sirius was

Summoning shadows of himself would look like just his outfit, mask, weapon and no right hand and neck. Theres now shadow for a shadow, but there is one fo clothes

And now to the rest of the things i mentioned