Pretty cool but I'm not into Greninja but I do know you did a awesome job. Especially the Chokuto/Nodachi on its back and the color of the blades is interesting. And that's is the real name of the swords. if they aren't curved like real katanas then they are called Chokuto or Nodachi. Chokuto or Nodachi are used by Shinobi/Ninjas. By the way I have created what a Super Typhlosion would be but there are some unique differences that I use.
Although we are not taking reference from Naruto when doing this. Because the whole Naruto concept is more jutsu Ninja. Just count how many Ninja using sword in Naruto. Sasuke is more like a samurai with outfit like that.
So, when we are drawing ninja (true ninjas), we always imagining these super cool ninjas Ryu Hayabusa (Ninja Gaiden), Strider Hiryu & Hotsuma (Shinobi)