A much better pic with a revamped urban ninja outfit and also decided to set aside my energy weapons to have with me a nihonto, which I want to own someday.
As for the technique I decided to go on with this kind of shading and also coloring combined with certain textures to add a better efect, through the more I explore it the more I see I should move onto photoshop, or do my lineart on SAI and then to color and shade and brush and all that on photoshop.

Someday I want to own a sword like that, but rather than buying the z-hunter katana that is actually a model with green blood added on the hamon which if you wield the damn thing will end up hurting you... I'm planning to get the real thing, and add myself a biohazard symbol tsuba (guard) sageo (green cord) and tsuka-ito (cord for the handle which goes on top of the ray skin).
If I were to own it, I would name my sword "Chronic" as in... you know... severe, terrible, attrocious.