Board Thread:General Discussion/@comment-62.155.218.241-20171021220319/@comment-4010415-20171126064634

Yeah, the writers said that Velvet's Semblance lets her mimic other people's fighting styles, which is why she was able to use her copies of their weapons so easily.

And, of course, Blake has her shadow clone Semblance and Sun has his light clone Semblance, like Majora pointed out.