Are you talking about making anime/manga style 3D models?
I am not sure of any online tutorials of this, but there is always google or another search engine. Try searching for something like:
Modelling a 3D manga girl
or something to that effect, since its unlikely you will find a tutorial exactly for blender, you can do one for another 3d modelling app and apply it to blender assuming it uses techniques available in blender.
Also, there is a book on the subject that I bought recently. If your looking for a book that has the edge loops and some tips not full blown tutorials its pretty good. Though, its tips really apply more to high poly, and since you appear to want to use this for a game, you would need to modify it for low-poly. I know you said websites, but as much as we want everything on the web, some stuff is hidden too well to be found as easily as a book store.
As for guns, there are plenty of CG tutorials on modelling weapons, though I’m not sure that they are laser guns. It should not be that hard to apply any gun modelling tutorial to what you want.
Good luck, welcome, and don’t be afraid to ask questions in here, most of us don’t bite.