Do you know a website that has a Shotgun Ninja build? I'm currently playing zero and can't figure out how I should use my points. The shotgun/Ninja way looks fun. --- "Guns are for show, Knives are for Pro" - Captian 'Soap'
Go down cunning to get two fang( to give shotty a chance at double shot), and then sniping to get bore so your shotgun pierces foes that group up around your decoy. A lot of fun. For the rest of the points just use your best judgement, those are the two main ones.
The borderlands 2 website has a skill calculator if you need help.