Yuuma (or Yuma) is an official Vocaloid developed and distributed door Bplats, Inc. His voice provider is unrevealed. VY2 is an abbreviation for "Vocaloid Yamaha 2." His item is the Wakizashi and he is avatar-less, although many concepts have been thought up for him, especially the one in the picture.
His voice is amazing. It's not too deep, like Kaito's voice. It works with almost any song and is compatible with a lot of the other Vocaloids. I feel like he's under-appreciated sometimes but I think that's just because he's not as populair as the older Vocaloids that have been around longer.
Some songs that I think really showcase his amazing voice are link and link featuring VY1 Mizki.
I do not own this Vocaloid of anything of the sort and probably never will so I can't review what I think of the product itself.
