Honestly in 99% of cases if its considered summoning Im going to say no. But I havent played Birth By Sleep so youre going to have to explain that one.

Does he break off part of himself in order to create it? Am I reading it right?

Edit: I didnt see the edit till after sorry! But I think Claymore Characters...Ill allow it if you're willing to limit use a bit. Also good luck fitting something of that size in the prison.